.VSIX file extension
To open .VSIX files on Windows, if the VSIX is for Visual Studio: open Visual Studio and use its extension installation flow, or (for inspection) rename the file from .vsix to .zip and extract it to view extension.vsixmanifest and other contents.
To open a .vsix file, you typically install it in the product it targets: Visual Studio (on Windows) or Visual Studio Code (cross-platform). If you only need to inspect its contents, you can treat it like a ZIP/OPC package and extract it to view files such as extension.vsixmanifest.
Last updated: June 12, 2026
Open on your device
Choose your operating system for a dedicated step-by-step opening guide.
How to open .VSIX files
Use these platform-specific instructions to open .VSIX files safely.
Windows
- If the VSIX is for Visual Studio: open Visual Studio and use its extension installation flow, or (for inspection) rename the file from .vsix to .zip and extract it to view extension.vsixmanifest and other contents.
- If the VSIX is for Visual Studio Code: open VS Code and choose “Install from VSIX” in the Extensions view, or use the command line with: code --install-extension path\to\file.vsix.
Mac
- In Visual Studio Code, use the Extensions view and choose “Install from VSIX”, or run: code --install-extension /path/to/file.vsix.
- To inspect without installing, copy the file to a desktop OS and extract it as a ZIP/OPC container (for example by renaming to .zip).
Linux
- In Visual Studio Code, use the Extensions view and choose “Install from VSIX”, or run: code --install-extension /path/to/file.vsix.
- To inspect without installing, extract it as a ZIP/OPC container (for example by renaming to .zip) and review the manifest and included files.
iOS
- .vsix files are meant to be installed by desktop development tools (Visual Studio/Visual Studio Code). Transfer the file to a PC/Mac/Linux machine and install it from within Visual Studio Code (Install from VSIX) or open it as a ZIP/OPC package for inspection.
Android
- .vsix files are meant to be installed by desktop development tools (Visual Studio/Visual Studio Code). Transfer the file to a PC/Mac/Linux machine and install it from within Visual Studio Code (Install from VSIX) or open it as a ZIP/OPC package for inspection.
Security notes
- A .vsix installs code and tooling into an IDE; treat it like installing software. Only install VSIX packages from sources you trust.
- Because VSIX is a ZIP/OPC container, it can carry many files; inspect the contents (including extension.vsixmanifest) before installing if you did not request the extension.
- The manifest controls installation behavior and what gets deployed; reviewing extension.vsixmanifest can help you spot unexpected components or targets before installation.
What can hide inside an archive
Compressed packages can contain executables or scripts you only see after extraction. Double extensions and nested archives are common tricks. Scan unexpected downloads before unpacking, and extract to an empty folder so you can review contents safely.
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Can't open this file?
These are the most common causes and fixes when .VSIX files fail to open.
Common reasons
- The VSIX installs in the wrong product (Visual Studio vs VS Code)
- Install fails due to compatibility requirements declared in the manifest
- Trying to “open” the file in a text editor shows gibberish
Fix steps
- Check which product the extension is intended for (for example, the download source or the manifest inside the VSIX).
- Install it using the correct tool: Visual Studio for Visual Studio extensions, or VS Code via “Install from VSIX” / code --install-extension for VS Code extensions.
OS-specific troubleshooting
What is a .VSIX file?
A VSIX package is an extension deployment format used by Visual Studio, built on the Open Packaging Conventions (OPC) standard (ZIP-based). A typical VSIX contains an extension manifest file named extension.vsixmanifest plus the extension’s payload files and metadata that controls installation behavior.
Background
VSIX is the packaging format used to distribute and install extensions for Visual Studio. Microsoft’s documentation describes a VSIX as an OPC package (a ZIP-based container) that includes a manifest (extension.vsixmanifest) and other content required by the extension.
Further reading
Authoritative resources for more details on the .VSIX format.
- Anatomy of a VSIX package - Visual Studio (Windows) | Microsoft Learn
- Using the VSIX Manifest Editor - Visual Studio Blog
- Extension Marketplace - Visual Studio Code documentation (Install from VSIX / --install-extension)
- ECMA-376 Office Open XML file formats (includes Open Packaging Conventions)
- List of filename extensions (S–Z) - Wikipedia (.vsix as Visual Studio VSIX Package)
- Media Types - IANA (registry reference for official MIME types)
Common .VSIX issues
The VSIX installs in the wrong product (Visual Studio vs VS Code)
Both Visual Studio and Visual Studio Code use .vsix for extensions, but the packages target different platforms and extension APIs. A VSIX built for one product typically will not install or function in the other.
- Check which product the extension is intended for (for example, the download source or the manifest inside the VSIX).
- Install it using the correct tool: Visual Studio for Visual Studio extensions, or VS Code via “Install from VSIX” / code --install-extension for VS Code extensions.
Install fails due to compatibility requirements declared in the manifest
VSIX packages include a manifest (extension.vsixmanifest) that declares installation behavior and requirements; if your installed IDE version doesn’t match, installation can be blocked.
- Extract the VSIX (it is a ZIP/OPC container) and review extension.vsixmanifest to understand the declared requirements.
- Install the extension in a compatible IDE version, or obtain a VSIX build that targets your IDE version.
Trying to “open” the file in a text editor shows gibberish
A VSIX is a ZIP/OPC package, so opening it as plain text will not display meaningful content.
- Inspect it by extracting it as an archive (for example, rename .vsix to .zip and extract).
- Look for extension.vsixmanifest and other package files to understand what the extension contains.
FAQ
Is a .vsix file just a ZIP file?
It is a ZIP-based Open Packaging Conventions (OPC) container. You can often inspect it by extracting it like a ZIP and viewing files such as extension.vsixmanifest.
Can Visual Studio Code install a local .vsix?
Yes. VS Code supports installing from a local VSIX using “Install from VSIX” in the Extensions view or by running: code --install-extension path/to/file.vsix.
What file inside the VSIX describes the extension?
The package typically contains a manifest named extension.vsixmanifest, which declares metadata, content types, and installation behavior.
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