.DIAGPKG File Extension
File TypeTroubleshooting Pack File
What is a DIAGPKG file?
File used by the Microsoft Support Diagnostic Tool (msdt.exe), a program used to help users troubleshoot computer problems; contains information required to locate and potentially fix a hardware or software issue; can be run by double-clicking the file in Windows.
NOTE: The Microsoft Support Diagnostic Tool is also referred to as the WTP Wizard. The acronym "WTP" stands for Windows Troubleshooting Platform, the technology that allows diagnostics packages to run.