[{"data":1,"prerenderedAt":31},["ShallowReactive",2],{"article:zip-based-formats-docx-apk-jar-odt-epub-pkpass:en":3},{"articleId":4,"id":5,"title":6,"slug":7,"hero_image_url":8,"content_html":9,"content_markdown":10,"meta_description":11,"excerpt":12,"languageCode":13,"keywords":14,"seedKeyword":15,"created_at":25,"updated_at":26,"_source":27,"alternateSlugs":28},31,310001,"ZIP-based formats explained: DOCX, APK, JAR, ODT, EPUB, PKPASS","zip-based-formats-docx-apk-jar-odt-epub-pkpass","/images/articles/zip-based-formats-docx-apk-jar-odt-epub-pkpass.jpeg","\u003Ch1>ZIP-based formats explained: DOCX, APK, JAR, ODT, EPUB, PKPASS\u003C/h1>\n\u003Cp>\u003Cimg src=\"/images/articles/zip-based-formats-docx-apk-jar-odt-epub-pkpass.jpeg\" alt=\"ZIP-based formats explained: DOCX, APK, JAR, ODT, EPUB, PKPASS\">\u003C/p>\n\u003Cp>Many familiar file types are not single-purpose binary formats. They are \u003Cstrong>ZIP-based containers\u003C/strong>: a ZIP archive with a required internal folder layout, metadata files, manifests, signatures, XML documents, compiled code, media assets, or other resources.\u003C/p>\n\u003Cp>That matters when a file refuses to open. A \u003Ccode>.docx\u003C/code>, \u003Ccode>.apk\u003C/code>, \u003Ccode>.jar\u003C/code>, \u003Ccode>.odt\u003C/code>, \u003Ccode>.epub\u003C/code>, or \u003Ccode>.pkpass\u003C/code> may look like one file in Finder or Explorer, but internally it is a package. If the ZIP structure is damaged, a required internal file is missing, or a signature no longer matches, the outer extension can be correct while the application still rejects the file.\u003C/p>\n\u003Ch2 id=\"tl-dr\">TL;DR\u003C/h2>\n\u003Cul>\u003Cli>ZIP-based formats usually begin with a ZIP-style \u003Ccode>PK\u003C/code> file signature.\u003C/li>\u003Cli>The extension tells you the intended workflow; the ZIP container only tells you how the bytes are packaged.\u003C/li>\u003Cli>You can often inspect these files with a ZIP tool, but editing and re-saving them can break relationships, manifests, signatures, or required metadata.\u003C/li>\u003Cli>Some ZIP-based files are documents, such as \u003Ccode>.docx\u003C/code>, \u003Ccode>.odt\u003C/code>, and \u003Ccode>.epub\u003C/code>. Others can contain executable code, such as \u003Ccode>.apk\u003C/code> and \u003Ccode>.jar\u003C/code>.\u003C/li>\u003Cli>If the extension and header disagree, check the header before trusting the file name.\u003C/li>\u003C/ul>\n\u003Ch2 id=\"what-zip-based-really-means\">What ZIP-based really means\u003C/h2>\n\u003Cp>A ZIP-based file uses the ZIP archive format as its outer container. Inside that container, the format defines a specific structure that the target application expects.\u003C/p>\n\u003Cp>A \u003Ccode>.docx\u003C/code> file is not just a ZIP backup. It is an Office Open XML package with XML parts, relationships, document metadata, styles, media, and content types. A \u003Ccode>.pkpass\u003C/code> file is not just a bundle of images and JSON; it is a signed Apple Wallet pass package. An \u003Ccode>.apk\u003C/code> is not a document at all; it is an Android application package.\u003C/p>\n\u003Cp>\u003Cstrong>ZIP container + required internal structure + application-specific rules = actual file format\u003C/strong>\u003C/p>\n\u003Ch2 id=\"common-zip-based-formats\">Common ZIP-based formats\u003C/h2>\n\u003Ctable>\u003Cthead>\u003Ctr>\u003Cth>Extension\u003C/th>\u003Cth>What it is\u003C/th>\u003Cth>Typical internal clues\u003C/th>\u003Cth>Main risk\u003C/th>\u003C/tr>\u003C/thead>\u003Ctbody>\u003Ctr>\u003Ctd>\u003Ccode>.docx\u003C/code>\u003C/td>\u003Ctd>Microsoft Word Open XML document\u003C/td>\u003Ctd>\u003Ccode>[Content_Types].xml\u003C/code>, \u003Ccode>_rels/\u003C/code>, \u003Ccode>word/document.xml\u003C/code>\u003C/td>\u003Ctd>Broken relationships, embedded content, misleading extension\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd>\u003Ccode>.apk\u003C/code>\u003C/td>\u003Ctd>Android application package\u003C/td>\u003Ctd>\u003Ccode>AndroidManifest.xml\u003C/code>, \u003Ccode>classes.dex\u003C/code>, \u003Ccode>res/\u003C/code>\u003C/td>\u003Ctd>Executable app code and permissions\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd>\u003Ccode>.jar\u003C/code>\u003C/td>\u003Ctd>Java archive\u003C/td>\u003Ctd>\u003Ccode>META-INF/MANIFEST.MF\u003C/code>, \u003Ccode>.class\u003C/code> files\u003C/td>\u003Ctd>Executable Java code\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd>\u003Ccode>.odt\u003C/code>\u003C/td>\u003Ctd>OpenDocument text document\u003C/td>\u003Ctd>\u003Ccode>mimetype\u003C/code>, \u003Ccode>content.xml\u003C/code>, \u003Ccode>META-INF/manifest.xml\u003C/code>\u003C/td>\u003Ctd>Macros, embedded objects, broken package structure\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd>\u003Ccode>.epub\u003C/code>\u003C/td>\u003Ctd>EPUB eBook\u003C/td>\u003Ctd>\u003Ccode>mimetype\u003C/code>, \u003Ccode>META-INF/container.xml\u003C/code>, XHTML/CSS/assets\u003C/td>\u003Ctd>Broken container metadata, active content in some readers\u003C/td>\u003C/tr>\u003Ctr>\u003Ctd>\u003Ccode>.pkpass\u003C/code>\u003C/td>\u003Ctd>Apple Wallet pass\u003C/td>\u003Ctd>\u003Ccode>pass.json\u003C/code>, \u003Ccode>manifest.json\u003C/code>, \u003Ccode>signature\u003C/code>, images\u003C/td>\u003Ctd>Signature failure after editing\u003C/td>\u003C/tr>\u003C/tbody>\u003C/table>\n\u003Ch2 id=\"why-the-extension-is-not-enough\">Why the file extension is not enough\u003C/h2>\n\u003Cp>The extension tells you what the file is supposed to be. It does not prove that the contents match. A file named \u003Ccode>invoice.docx\u003C/code> might be a valid Word document, a damaged ZIP container, a generic ZIP archive with the wrong extension, a different format renamed to \u003Ccode>.docx\u003C/code>, or a suspicious file trying to look harmless.\u003C/p>\n\u003Cp>ZIP-based formats commonly start with ZIP signatures such as \u003Ccode>PK\u003C/code>. Open-The-File.com includes a \u003Ca href=\"https://open-the-file.com/tools/header-analyzer\">header analyzer\u003C/a> for this exact situation: when the extension and the actual file bytes may not tell the same story.\u003C/p>\n\u003Ch2 id=\"docx-word-document-as-a-package\">DOCX: Word document as a package\u003C/h2>\n\u003Cp>A \u003Ccode>.docx\u003C/code> file is a Microsoft Word document based on Office Open XML. Internally, it is a ZIP package with XML files and related resources such as \u003Ccode>[Content_Types].xml\u003C/code>, \u003Ccode>_rels/.rels\u003C/code>, \u003Ccode>word/document.xml\u003C/code>, styles, media, and relationships.\u003C/p>\n\u003Cp>If a DOCX opens as a ZIP but Word refuses it, the problem is usually not ZIP support. It is more likely that a required XML part is missing, a relationship points to a missing file, or the package was modified incorrectly.\u003C/p>\n\u003Cp>Helpful pages: \u003Ca href=\"https://open-the-file.com/file-extension/docx\">open DOCX files\u003C/a>, \u003Ca href=\"https://open-the-file.com/file-extension/doc\">open DOC files\u003C/a>, and \u003Ca href=\"https://open-the-file.com/file-extension/docm\">open DOCM files\u003C/a>.\u003C/p>\n\u003Ch2 id=\"apk-android-app-package\">APK: Android app package\u003C/h2>\n\u003Cp>An \u003Ccode>.apk\u003C/code> file is an Android application package. It is ZIP-based, but it is not a normal archive you simply extract and use. Android expects compiled code, resources, metadata, permissions, and signing information. Typical clues include \u003Ccode>AndroidManifest.xml\u003C/code>, \u003Ccode>classes.dex\u003C/code>, \u003Ccode>res/\u003C/code>, and \u003Ccode>resources.arsc\u003C/code>.\u003C/p>\n\u003Cp>\u003Cstrong>Security note:\u003C/strong> APK files can install executable app code. Do not sideload APKs from untrusted sources just because they look like archives.\u003C/p>\n\u003Cp>Helpful pages: \u003Ca href=\"https://open-the-file.com/file-extension/apk\">open APK files\u003C/a>, \u003Ca href=\"https://open-the-file.com/file-extension/aab\">open AAB files\u003C/a>, and \u003Ca href=\"https://open-the-file.com/file-extension/xapk\">open XAPK files\u003C/a>.\u003C/p>\n\u003Ch2 id=\"jar-java-archive\">JAR: Java archive\u003C/h2>\n\u003Cp>A \u003Ccode>.jar\u003C/code> file is a Java Archive. It often contains \u003Ccode>META-INF/MANIFEST.MF\u003C/code>, Java \u003Ccode>.class\u003C/code> files, package folders, and resources. You can inspect it with ZIP tools or the Java \u003Ccode>jar\u003C/code> command, but a runnable JAR may execute Java code.\u003C/p>\n\u003Cp>Helpful pages: \u003Ca href=\"https://open-the-file.com/file-extension/jar\">open JAR files\u003C/a> and \u003Ca href=\"https://open-the-file.com/file-extension/war\">open WAR files\u003C/a>.\u003C/p>\n\u003Ch2 id=\"odt-opendocument-text-package\">ODT: OpenDocument text package\u003C/h2>\n\u003Cp>An \u003Ccode>.odt\u003C/code> file is an OpenDocument Text document used by office suites such as LibreOffice. It usually contains a \u003Ccode>mimetype\u003C/code> file, \u003Ccode>content.xml\u003C/code>, \u003Ccode>styles.xml\u003C/code>, \u003Ccode>meta.xml\u003C/code>, and \u003Ccode>META-INF/manifest.xml\u003C/code>.\u003C/p>\n\u003Cp>If an ODT is damaged, a ZIP tool may still show files inside, but the office suite may reject it if required metadata or XML is missing.\u003C/p>\n\u003Cp>Helpful pages: \u003Ca href=\"https://open-the-file.com/file-extension/odt\">open ODT files\u003C/a>, \u003Ca href=\"https://open-the-file.com/file-extension/ods\">open ODS files\u003C/a>, and \u003Ca href=\"https://open-the-file.com/file-extension/odp\">open ODP files\u003C/a>.\u003C/p>\n\u003Ch2 id=\"epub-ebook-as-a-zip-container\">EPUB: eBook as a ZIP container\u003C/h2>\n\u003Cp>An \u003Ccode>.epub\u003C/code> file is an eBook package. Internally, it uses a strict ZIP-based structure with \u003Ccode>mimetype\u003C/code>, \u003Ccode>META-INF/container.xml\u003C/code>, XHTML or HTML content, CSS, images, fonts, and navigation metadata.\u003C/p>\n\u003Cp>If an EPUB opens as a ZIP but not in an eBook reader, check whether \u003Ccode>META-INF/container.xml\u003C/code> points to the actual book package.\u003C/p>\n\u003Cp>Helpful pages: \u003Ca href=\"https://open-the-file.com/file-extension/epub\">open EPUB files\u003C/a>, \u003Ca href=\"https://open-the-file.com/file-extension/mobi\">open MOBI files\u003C/a>, and \u003Ca href=\"https://open-the-file.com/file-extension/azw3\">open AZW3 files\u003C/a>.\u003C/p>\n\u003Ch2 id=\"pkpass-apple-wallet-pass-package\">PKPASS: Apple Wallet pass package\u003C/h2>\n\u003Cp>A \u003Ccode>.pkpass\u003C/code> file is an Apple Wallet pass. It is ZIP-based, but the important part is not only the file structure. It is the signature. Typical contents include \u003Ccode>pass.json\u003C/code>, \u003Ccode>manifest.json\u003C/code>, \u003Ccode>signature\u003C/code>, images, and localized folders.\u003C/p>\n\u003Cp>If you unzip a PKPASS, edit an image, and zip it again, it will usually stop working because the manifest and signature no longer match the package contents.\u003C/p>\n\u003Cp>Helpful page: \u003Ca href=\"https://open-the-file.com/file-extension/pkpass\">open PKPASS files\u003C/a>.\u003C/p>\n\u003Ch2 id=\"when-renaming-to-zip-helps\">When renaming to .zip helps—and when it does not\u003C/h2>\n\u003Cp>Renaming a copy of a file to \u003Ccode>.zip\u003C/code> can help you inspect the contents if the file is truly ZIP-based. But renaming is not conversion. It does not repair a corrupted central directory, create missing XML files, fix invalid signatures, turn an APK into a safe archive, or preserve application-specific rules after careless editing.\u003C/p>\n\u003Col>\u003Cli>Make a copy of the file.\u003C/li>\u003Cli>Check the header or inspect with a trusted archive tool.\u003C/li>\u003Cli>Extract only for analysis, not as the primary editing workflow.\u003C/li>\u003Cli>Use the official app or format-specific tools to modify the file.\u003C/li>\u003Cli>Re-export from the original application when possible.\u003C/li>\u003C/ol>\n\u003Ch2 id=\"troubleshooting-zip-based-files\">Troubleshooting ZIP-based files\u003C/h2>\n\u003Ch3>The app says the file is corrupt\u003C/h3>\u003Cp>Possible causes include an incomplete download, a damaged ZIP central directory, missing internal files, malformed XML, or a file that was edited and repackaged incorrectly.\u003C/p>\n\u003Ch3>A ZIP tool opens it, but the real app does not\u003C/h3>\u003Cp>That usually means the ZIP container is readable, but the application-specific structure is wrong. A generic ZIP tool does not validate Word relationships, EPUB package metadata, Android signatures, or Wallet pass signatures.\u003C/p>\n\u003Ch3>The file has no extension\u003C/h3>\u003Cp>Check the header first. If it starts with ZIP-style bytes, inspect the internal names. \u003Ccode>word/\u003C/code> suggests the DOCX family. \u003Ccode>xl/\u003C/code> suggests XLSX. \u003Ccode>ppt/\u003C/code> suggests PPTX. \u003Ccode>AndroidManifest.xml\u003C/code> and \u003Ccode>classes.dex\u003C/code> suggest APK. \u003Ccode>META-INF/container.xml\u003C/code> suggests EPUB. \u003Ccode>pass.json\u003C/code> plus \u003Ccode>manifest.json\u003C/code> and \u003Ccode>signature\u003C/code> suggests PKPASS.\u003C/p>\n\u003Ch2 id=\"security-checklist\">Security checklist\u003C/h2>\n\u003Col>\u003Cli>Confirm the sender and context.\u003C/li>\u003Cli>Check whether the extension matches the file header.\u003C/li>\u003Cli>Avoid executing APK or JAR files from unknown sources.\u003C/li>\u003Cli>Do not enable macros or active content unless you trust the file.\u003C/li>\u003Cli>Use updated software to parse complex documents and archives.\u003C/li>\u003Cli>Prefer official viewers, app stores, or vendor tools for installation packages.\u003C/li>\u003Cli>Keep a copy before extracting, editing, or repackaging.\u003C/li>\u003C/ol>\n\u003Ch2 id=\"related-tools-and-guides\">Related tools and guides\u003C/h2>\n\u003Cul>\u003Cli>\u003Ca href=\"https://open-the-file.com/tools/header-analyzer\">Header analyzer\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension\">File extension index\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension/zip\">Open ZIP files\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension/docx\">Open DOCX files\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension/apk\">Open APK files\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension/jar\">Open JAR files\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension/odt\">Open ODT files\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension/epub\">Open EPUB files\u003C/a>\u003C/li>\u003Cli>\u003Ca href=\"https://open-the-file.com/file-extension/pkpass\">Open PKPASS files\u003C/a>\u003C/li>\u003C/ul>\n\u003Ch2 id=\"bottom-line\">Bottom line\u003C/h2>\n\u003Cp>ZIP-based formats are convenient because they package many pieces into one file. They are also easy to misunderstand. A \u003Ccode>.docx\u003C/code>, \u003Ccode>.apk\u003C/code>, \u003Ccode>.jar\u003C/code>, \u003Ccode>.odt\u003C/code>, \u003Ccode>.epub\u003C/code>, or \u003Ccode>.pkpass\u003C/code> may all share ZIP as a container, but they are not interchangeable. The extension tells you the workflow, the header tells you the container, and the internal structure tells you what the file really is.\u003C/p>\n\u003Cp>When in doubt, inspect first, execute last.\u003C/p>","# ZIP-based formats explained: DOCX, APK, JAR, ODT, EPUB, PKPASS\n\n![ZIP-based formats explained: DOCX, APK, JAR, ODT, EPUB, PKPASS](/images/articles/zip-based-formats-docx-apk-jar-odt-epub-pkpass.svg)\n\nMany familiar file types are not single-purpose binary formats. They are **ZIP-based containers**: a ZIP archive with a required internal folder layout, metadata files, manifests, signatures, XML documents, compiled code, media assets, or other resources.\n\nThat matters when a file refuses to open. A `.docx`, `.apk`, `.jar`, `.odt`, `.epub`, or `.pkpass` may look like one file in Finder or Explorer, but internally it is a package. If the ZIP structure is damaged, a required internal file is missing, or a signature no longer matches, the outer extension can be correct while the application still rejects the file.\n\n## TL;DR\n\n- ZIP-based formats usually begin with a ZIP-style `PK` file signature.\n- The extension tells you the intended workflow; the ZIP container only tells you how the bytes are packaged.\n- You can often inspect these files with a ZIP tool, but editing and re-saving them can break relationships, manifests, signatures, or required metadata.\n- Some ZIP-based files are documents, such as `.docx`, `.odt`, and `.epub`. Others can contain executable code, such as `.apk` and `.jar`.\n- If the extension and header disagree, check the header before trusting the file name.\n\n## What ZIP-based really means\n\nA ZIP-based file uses the ZIP archive format as its outer container. Inside that container, the format defines a specific structure that the target application expects.\n\n**ZIP container + required internal structure + application-specific rules = actual file format**\n\n## Common ZIP-based formats\n\n| Extension | What it is | Typical internal clues | Main risk |\n|---|---|---|---|\n| `.docx` | Microsoft Word Open XML document | `[Content_Types].xml`, `_rels/`, `word/document.xml` | Broken relationships, embedded content, misleading extension |\n| `.apk` | Android application package | `AndroidManifest.xml`, `classes.dex`, `res/` | Executable app code and permissions |\n| `.jar` | Java archive | `META-INF/MANIFEST.MF`, `.class` files | Executable Java code |\n| `.odt` | OpenDocument text document | `mimetype`, `content.xml`, `META-INF/manifest.xml` | Macros, embedded objects, broken package structure |\n| `.epub` | EPUB eBook | `mimetype`, `META-INF/container.xml`, XHTML/CSS/assets | Broken container metadata, active content in some readers |\n| `.pkpass` | Apple Wallet pass | `pass.json`, `manifest.json`, `signature`, images | Signature failure after editing |\n\n## Why the file extension is not enough\n\nThe extension tells you what the file is supposed to be. It does not prove that the contents match. ZIP-based formats commonly start with ZIP signatures such as `PK`. Open-The-File.com includes a [header analyzer](https://open-the-file.com/tools/header-analyzer) for this exact situation.\n\n## Format notes\n\n### DOCX\n\nA `.docx` file is a Microsoft Word document based on Office Open XML. Internally, it is a ZIP package with XML files and related resources. Helpful pages: [open DOCX files](https://open-the-file.com/file-extension/docx), [open DOC files](https://open-the-file.com/file-extension/doc), and [open DOCM files](https://open-the-file.com/file-extension/docm).\n\n### APK\n\nAn `.apk` file is an Android application package. It is ZIP-based, but it is not a normal archive you simply extract and use. APK files can install executable app code. Helpful pages: [open APK files](https://open-the-file.com/file-extension/apk), [open AAB files](https://open-the-file.com/file-extension/aab), and [open XAPK files](https://open-the-file.com/file-extension/xapk).\n\n### JAR\n\nA `.jar` file is a Java Archive. You can inspect it with ZIP tools or the Java `jar` command, but a runnable JAR may execute Java code. Helpful pages: [open JAR files](https://open-the-file.com/file-extension/jar) and [open WAR files](https://open-the-file.com/file-extension/war).\n\n### ODT\n\nAn `.odt` file is an OpenDocument Text document used by office suites such as LibreOffice. Helpful pages: [open ODT files](https://open-the-file.com/file-extension/odt), [open ODS files](https://open-the-file.com/file-extension/ods), and [open ODP files](https://open-the-file.com/file-extension/odp).\n\n### EPUB\n\nAn `.epub` file is an eBook package with `mimetype`, `META-INF/container.xml`, XHTML or HTML content, CSS, images, fonts, and navigation metadata. Helpful pages: [open EPUB files](https://open-the-file.com/file-extension/epub), [open MOBI files](https://open-the-file.com/file-extension/mobi), and [open AZW3 files](https://open-the-file.com/file-extension/azw3).\n\n### PKPASS\n\nA `.pkpass` file is an Apple Wallet pass. It is ZIP-based, but the important part is the signature. If you edit and re-zip it, it will usually stop working because the manifest and signature no longer match. Helpful page: [open PKPASS files](https://open-the-file.com/file-extension/pkpass).\n\n## When renaming to .zip helps—and when it does not\n\nRenaming a copy of a file to `.zip` can help you inspect the contents if the file is truly ZIP-based. But renaming is not conversion. It does not repair a corrupted central directory, create missing XML files, fix invalid signatures, turn an APK into a safe archive, or preserve application-specific rules after careless editing.\n\n## Security checklist\n\n1. Confirm the sender and context.\n2. Check whether the extension matches the file header.\n3. Avoid executing APK or JAR files from unknown sources.\n4. Do not enable macros or active content unless you trust the file.\n5. Use updated software to parse complex documents and archives.\n6. Prefer official viewers, app stores, or vendor tools for installation packages.\n7. Keep a copy before extracting, editing, or repackaging.\n\n## Related tools and guides\n\n- [Header analyzer](https://open-the-file.com/tools/header-analyzer)\n- [File extension index](https://open-the-file.com/file-extension)\n- [Open ZIP files](https://open-the-file.com/file-extension/zip)\n- [Open DOCX files](https://open-the-file.com/file-extension/docx)\n- [Open APK files](https://open-the-file.com/file-extension/apk)\n- [Open JAR files](https://open-the-file.com/file-extension/jar)\n- [Open ODT files](https://open-the-file.com/file-extension/odt)\n- [Open EPUB files](https://open-the-file.com/file-extension/epub)\n- [Open PKPASS files](https://open-the-file.com/file-extension/pkpass)\n\n## Bottom line\n\nZIP-based formats are convenient because they package many pieces into one file. They are also easy to misunderstand. A `.docx`, `.apk`, `.jar`, `.odt`, `.epub`, or `.pkpass` may all share ZIP as a container, but they are not interchangeable.\n\nWhen in doubt, inspect first, execute last.\n","Learn why DOCX, APK, JAR, ODT, EPUB and PKPASS are ZIP-based containers, how to inspect them safely, and when renaming to .zip helps.","DOCX, APK, JAR, ODT, EPUB and PKPASS all use ZIP as a container, but each has its own structure, rules and security risks.","en-US",[15,16,17,18,19,20,21,22,23,24],"ZIP-based formats","DOCX","APK","JAR","ODT","EPUB","PKPASS","file signatures","magic bytes","file extension","2026-06-12T13:20:00.000Z","2026-06-12T13:45:00.000Z","manual",{"en":7,"de":29,"it":30},"zip-basierte-formate-erklrt-docx-apk-jar-odt-epub-pkpass","formati-basati-su-zip-spiegati-docx-apk-jar-odt-epub-pkpass",1781269501938]