Thursday, May 17, 2012

gacutil.exe is not a valid Win32 application

Context:

Windows XP

Problem:

C:\Program Files\Microsoft SDKs\Windows\v7.0A\bin\NETFX 4.0 Tools\gacutil.exe was fine before until today when it suddenly threw me this error saying that it's not a valid Win32 application.

Solution:

It turned out that the error was caused by some recent Windows updates/installs.  When I restored my system to a prior point, it started working again.

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