Ever since I upgraded to 64 bit Windows 7, I have not been able to connect to remote 32 bit DirectShow graphs from GraphEdit :-( . Well... not any more :-) . Thanks to one of my customers, who unveiled the secret :-) . It turns out there is a DLL provided in the Microsoft SDK that is not registered during the install of the SDK.
To enable the functionality copy the 32 bit version of the proppage.dll from the SDK (in the 7.1 version of the SDK in C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin ) to the Windows\SysWOW64 directory.
Then run the:
after that you will be able to connect to the registered DirectShow graphs from GraphEdit.