DIAGCAB File

Did your computer fail to open a DIAGCAB file? We explain what they are used for and recommend software that we know can open or otherwise 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.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Suggest another file format using extension DIAGCAB

While we know of one file format using the .DIAGCAB file extension, there may be more. It is widespread that different programs use files with the same file extension for very different types of data. Please let us know if you are aware of a different kind of .DIAGCAB file.

Various DIAGCAB file openers, viewers, etc.

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.

Free File ViewerFree File ViewerUser submitted
Ultra File OpenerUltra File OpenerUser submitted
We have not verified any software that we know for certain will work with DIAGCAB-files on Mac. If you know one, please use the 'Suggest a program' link below and tell us about it!
We have not verified any web services that we know for certain will work with DIAGCAB-files. If you know one, please use the 'Suggest a program' link below and tell us about it!