This is expected behavior. Visual FoxPro, which hosts FoxWeb channels, is a 32-bit application, so it can only run 32-bit DLLs.
FoxWeb Support Team
Sent by Martin Martin on 04/22/2012 04:18:20 PM:
After installing Ghostscript 64bit and follow the instruction FoxWeb Control center give me the error "Specified file is not a valid Ghostscript DLL"
So I removed 64bits version and re-install all with the 32bits version.
Then Control Center accept it and ... Now it's working.
Just to let you know
C:\Program Files\gs\gs9.02\bin\gsdll64.dll (Specified file is not a valid Ghostscript DLL)