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.PAT file extension

To open .PAT files on Windows, if the file came from CorelDRAW: open CorelDRAW and use its pattern fill/pattern resources workflow to load or apply the pattern (rather than expecting the .PAT to open like a photo).

To open a .PAT file, first identify which kind it is: CorelDRAW pattern (.pat used for fills) or a CAD hatch pattern (.pat). CorelDRAW is the primary app for CorelDRAW pattern .PAT files; CAD programs (e.g., AutoCAD-family workflows) use .PAT hatch files differently and may not “open” them as images.

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Last updated: June 11, 2026 · Reviewed by Julian Stricker

What “reviewed” means on this page
  • Format fit: whether the “what is this file?” description matches common real-world use of the extension, including category, typical MIME types, and aliases.
  • Opening paths: whether Windows / macOS / Linux steps read plausibly for current OS dialogs and default apps; we remove fantasy menus and unsafe shortcuts.
  • Security framing: whether risk notes match the extension class (for example executables vs plain data) and whether affiliate wording does not contradict the security section.
  • Sources and further reading: whether external links point to vendors, standards bodies, or other primary references where possible; we avoid inventing details we cannot ground.
  • Limits: this is clarity and safety-messaging QA, not a guarantee that every statement is exhaustive or that every binary you download is harmless.

Full methodology in the Imprint — The Imprint also states where AI is used and what that does—and does not—replace.

Open on your device

Choose your operating system for a dedicated step-by-step opening guide.

How to open .PAT files

Use these platform-specific instructions to open .PAT files safely.

Windows

  1. If the file came from CorelDRAW: open CorelDRAW and use its pattern fill/pattern resources workflow to load or apply the pattern (rather than expecting the .PAT to open like a photo).
  2. If it came from CAD: open your CAD application and load/add the .PAT as a hatch/pattern definition within the hatch/pattern tools (it may not be viewable as an image).
  3. If double-clicking fails, use "Open with" to choose the correct application (CorelDRAW for Corel patterns; your CAD app for CAD hatch patterns).
Full Windows guide

Mac

  1. If the file is a CorelDRAW pattern: open it with CorelDRAW (macOS availability depends on your installed CorelDRAW version) and load/apply it via pattern fill features.
  2. If it is a CAD hatch .PAT: open it from within your CAD program’s hatch/pattern manager (these files often are not meant to be opened directly).
Full Mac guide

Linux

  1. Linux desktops may not have a standard default handler for .PAT because the extension is ambiguous; determine whether it is CorelDRAW pattern or CAD hatch first.
  2. Open it in the originating desktop software (CorelDRAW on a supported platform, or your CAD tool) and import/load it as a pattern resource rather than expecting an image preview.
Full Linux guide

iOS

  1. iOS typically won’t preview .PAT files reliably; transfer the file to a desktop where CorelDRAW or your CAD application can load it as a pattern/hatch resource.
Full iOS guide

Android

  1. Android typically won’t open .PAT files as images; send the file to a desktop and open it in CorelDRAW (for Corel patterns) or in your CAD application (for hatch patterns).
Full Android guide

Security notes

  • .PAT files are typically data/resources, but they are still parsed by complex applications (graphics/CAD), so only open patterns from sources you trust to reduce the risk of malformed-file parser vulnerabilities.
  • Be cautious with unexpected .PAT email attachments: the extension is ambiguous, and a file may not be what it claims to be; verify its origin and intended application before opening.
  • Avoid “fixing” a .PAT by renaming it to another extension; instead, open it in the correct program or obtain the file again from the source workflow.

Complex decoders and untrusted media

Image, audio, and video decoders are large software surfaces; issues are uncommon for everyday files but show up with crafted files from unknown sources. Keeping the OS and media apps updated matters most; scanning is reasonable extra caution for downloads you cannot vouch for.

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Norton

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Can't open this file?

These are the most common causes and fixes when .PAT files fail to open.

Common reasons

  • .PAT won’t open or shows the wrong app
  • I expected an image preview, but it’s not viewable
  • Pattern/hatch doesn’t appear or looks wrong after loading

Fix steps

  1. Confirm the source/workflow (CorelDRAW pattern fill vs CAD hatch pattern).
  2. Open the file from inside the correct application using its pattern/hatch import or load function.
  3. If needed, change the file association ("Open with") to the correct program for your workflow.

OS-specific troubleshooting

What is a .PAT file?

.PAT is an ambiguous extension. In graphics workflows, a CorelDRAW Pattern file stores a reusable pattern resource that CorelDRAW can load and apply as a pattern fill to objects. In CAD workflows, .PAT often refers to hatch/pattern definition files used by CAD applications to define hatch fills (a different, unrelated format).

Background

In CorelDRAW, patterns are used to fill shapes with repeated bitmap or vector designs. CorelDRAW supports applying patterns as fills, and its SDK documentation describes loading external pattern files for pattern fills, which aligns with .PAT being used as a pattern resource file in this ecosystem.

Because .PAT is also a common extension in CAD for hatch/pattern files, many .PAT files you encounter are not “image files” you can view directly. CAD .PAT files typically act as pattern definition data that gets loaded/assigned inside a CAD program rather than displayed as a standalone picture.

Practically, the best clue is the source: if it came from a CorelDRAW library/workflow or is meant for shape fills, treat it as a CorelDRAW Pattern file; if it came from a CAD project, it is likely a hatch pattern definition. When in doubt, avoid renaming the extension and instead try opening/importing it in the application it was created for.

Common MIME types: image/x-coreldrawpattern

Further reading

Authoritative resources for more details on the .PAT format.

Common .PAT issues

.PAT won’t open or shows the wrong app

The .pat extension is used by multiple unrelated formats (CorelDRAW patterns and CAD hatch definitions), so the OS may not know which program to use.

  1. Confirm the source/workflow (CorelDRAW pattern fill vs CAD hatch pattern).
  2. Open the file from inside the correct application using its pattern/hatch import or load function.
  3. If needed, change the file association ("Open with") to the correct program for your workflow.

I expected an image preview, but it’s not viewable

Many .PAT files are pattern resources/definitions, not standalone raster images meant for gallery-style viewing.

  1. Use CorelDRAW’s pattern fill features to apply the pattern to an object and preview it in-document.
  2. If it’s a CAD hatch .PAT, apply it as a hatch in the CAD tool to see the pattern rendered.
  3. If you need a shareable preview, create a screenshot or export from the host application after applying the pattern.

Pattern/hatch doesn’t appear or looks wrong after loading

Pattern resources can depend on how they’re applied (scale, rotation, spacing) or on application-specific interpretation of the pattern definition.

  1. Adjust pattern fill parameters (scale/rotation/offset) in CorelDRAW or hatch settings in your CAD tool.
  2. Verify you’re using the correct .PAT type for your application (Corel pattern vs CAD hatch).

FAQ

Is .PAT always a CorelDRAW image/pattern file?

No. A very common alternative use is CAD hatch/pattern definition files. The correct way to open it depends on whether it came from CorelDRAW pattern fills or a CAD project.

How do I open a CorelDRAW .PAT file?

Use CorelDRAW and load/apply it through pattern fill/pattern resources features. It may not open like a typical photo viewer because it’s a pattern resource used inside documents.

Can I convert .PAT by renaming it to PNG/JPG?

No. Renaming only changes the filename extension. To get an image, apply the pattern in the host app (CorelDRAW or your CAD tool) and export/render from there.

What is the official MIME type for .PAT?

There is no single official MIME type guaranteed for all .PAT files because the extension is ambiguous. Any vendor-style type you may see is likely non-standard; consult the IANA media types registry to confirm whether a MIME type is registered.

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