GAC is nothing but the folder where we have installed the shared assemblies. Still framework 2.0 it was installed in the folder C:\Windows\assembly\ The location of the GAC is changed by the framework 4.0. When installing the assemblies created by 4.0 Environment, it will install in the following folder: C:\Windows\Microsoft.NET\assembly\GAC_MSIL\MySharedAssemebly\v4.0_10.0.0.0__b03f5f7f11d50a3a\ C:\Windows\Microsoft.NET\assembly\GAC_32\CustomMarshalers\v4.0_4.0.0.0__b03f5f7f11d50a3a The assemblies created by us will be installed under the GAC_MSIL folder. GAC_MSIL contains assemblies thet are run 32 bit or 64 bit machines. GAC_32 is only for 32 bit machine assemblies. Here, MySharedAssemebly is the shared assembly name.
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