What is a RSRC file?
A .RSRC file is primarily a Macintosh Resource File created by Apple software. It stores the "resource fork" of a macOS file, which contains structured data like icons, menus, window layouts, and localized text. Operating systems often use the AppleDouble format to preserve this hidden data when transferring files to non-Mac file systems, such as Windows USB drives.
However, the .RSRC extension has multiple possible meanings. It can also be a compiled application resource file for the Microsoft .NET Framework, a game asset data file for the Godot Engine, or a resource file for classic games like Civilization II.
How to open RSRC files?
If you use a Mac, the system processes resource forks automatically. Apple developers can inspect them using command-line tools like `DeRez`. If you are working with a .NET file, you can compile and view it using Visual Studio or the `resgen.exe` tool.
If you are unsure of the origin of your file, viewer.online/rsrc analyzes .RSRC files to identify their exact format and creator software, shows which programs can open the file, and usually previews it.
Best practices and troubleshooting
Windows and Linux users frequently encounter unexpected .RSRC files on external drives. These are created automatically by macOS. Deleting them is usually safe on a PC, as doing so only removes custom Mac metadata and icons, leaving the primary file data completely untouched.
Summary
Because .RSRC files use the known AppleDouble format, viewer.online/rsrc can safely open and display them online, eliminating compatibility problems.