Event ID - 12633

Event Id12633
SourceMicrosoft-Windows-Hyper-V-VMMS
DescriptionThe file extension for '%3' is invalid.
Event InformationAccording to Microsoft :
Cause
This event is logged when the file extension is invalid.
Resolution
Check file name extension
Check that the path to a file with a valid file name extension.
Verify
The virtual machine is able to power on successfully at the end of the operation.
Reference LinksEvent ID 12633 from Source Microsoft-Windows-Hyper-V-VMMS

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