The Explorer extension the framework installs to view the GAC

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You can also map a drive directly to your GAC and then you'll be able to see the actual directory structure.

Go into command prompt and type:  subst z: %windir%\assembly\gac

I got this info from https://weblogs.asp.net/jkey/archive/2003/02/25/3006.aspx

-------------------------ONE MORE WAY-----------------------------------------

1. Open Regedit, browse to HKLM\Software\Microsoft\Fusion.

2. Add a REG_DWORD value named 'DisableCacheViewer'; set it to 1

3. Open an Explorer window and type in C:\WINDOWS\assembly\GAC_MSIL\