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What are DIAGCAB files and how to open them

Are you having problems opening a DIAGCAB file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your DIAGCAB files.

What is a DIAGCAB file?

A .DIAGCAB file is a Diagnostic Cabinet file.

Microsoft developed the DIAGCAB file format as a data and archive file format for Windows Vista, 7, 8, and 10. These .diagcab files are generated by the makecab tool, a Windows application built into these Windows OS versions. The data stored in a DIAGCAB file can be viewed using the Microsoft Support Diagnostic Tool, which is another application that's also available in these Windows OS versions.

The Windows Troubleshooting service uses these .diagcab files, which were introduced in Windows Vista. This application assists users in detecting problems and repairing system issues. This can also be used to send error logs and reports to Microsoft servers for analysis.

How to open DIAGCAB files

Important: Different programs may use files with the DIAGCAB file extension for different purposes, so unless you are sure which format your DIAGCAB file is, you may need to try a few different programs.

While we have not verified the app ourselves yet, our users have suggested a single DIAGCAB opener which you will find listed below.

Last updated: December 21, 2023

Various apps that use files with this extension

These apps are known to open certain types of DIAGCAB files. Remember, different programs may use DIAGCAB files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Unzip OneUnzip OneUser submitted

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