Getting the Microsoft.Office.Interop.Visio.dll assembly from the GAC

Launch CMD

Run this command

SUBST X: C:\Windows\assembly

CD to the location of the Assembly

CD X:\GAC_MSIL\Microsoft.Office.Interop.Visio\14.0.0.0__71e9bce111e9429c

Copy the Microsoft.Office.Interop.dll out of the folder

COPY X:\GAC_MSIL\Microsoft.Office.Interop.Visio\14.0.0.0__71e9bce111e9429c\Microsoft.Office.Interop.Dll d:\PIA