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DIAGCAB CAB
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Convert DIAGCAB to CAB

Can you convert DIAGCAB to CAB?
Verified by Adam B.· reviewed by FE Editorial ·updated Jul 5, 2026
QUICK ANSWER
Is it possible to convert DIAGCAB to CAB?
No - not a direct conversion.

Any CAB-capable tool opens a .diagcab directly without renaming. To inspect the contents, open the file in 7-Zip. Renaming the extension to .cab is harmless but unnecessary.

No direct path
Also to CAB: MSU · XSN · WSP

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert DIAGCAB to CAB?

Both .diagcab and .cab use the identical Microsoft Cabinet format with the same MSCF magic bytes and internal binary structure. The .diagcab extension is only a label Windows uses to route the file to the troubleshooter engine (msdt.exe) instead of treating it as a generic archive. There is no data transformation involved.

How to convert DIAGCAB to CAB

7-Zip OPEN-SOURCE

Right-click the .diagcab and choose 7-Zip > Open archive - it reads the file directly as a CAB without any renaming or conversion step.

expand FREE

Run expand diagcab_file.diagcab -F:* output_folder in Command Prompt to extract all contents from the cabinet - no conversion needed.

About these formats

.DIAGCAB Windows Troubleshooting Pack (Troubleshooter Cabinet)

A DIAGCAB file is a Windows troubleshooter - a cabinet (CAB) archive containing PowerShell scripts that detect and fix a specific Windows problem such as printing, audio, or Windows Update.…

Open .DIAGCAB details →
.CAB Windows Cabinet Archive

A CAB (Cabinet) file is Microsoft's compressed archive format, used to ship Windows drivers, updates, and installer payloads. On Windows, double-click it in File Explorer to browse, or use…

Open .CAB details →

Quality & what to watch

  • Renaming .diagcab to .cab is harmless - the internal structure is identical - but unnecessary since tools like 7-Zip already open the original extension directly.
  • The .diagcab extension routes the file to msdt.exe (the Windows troubleshooter engine), which reads the PowerShell scripts and answer file inside.
  • On Windows 11, many .diagcab troubleshooters are deprecated or blocked as Microsoft has moved built-in fixes to Settings > System > Troubleshoot.

Frequently asked questions

Can I open a .diagcab in any CAB tool without renaming it?
Yes - 7-Zip and the Windows expand command both handle .diagcab files directly without renaming required.
Is there a converter that turns DIAGCAB into CAB?
No such converter exists because the two formats are identical. Sites advertising a conversion have nothing real to offer.
What is inside a .diagcab file?
A .diagcab contains PowerShell scripts (.ps1) and a troubleshooting metadata answer file used by msdt.exe to run the repair wizard.