>>>>I created a Innosetup installation program. It attempts to register some DLL (ie. Filer.dll). The setup fails when registers thee DLL with an Unable to register error. I have tried to run the setup as administrator, but get the same error. Is there a trick to getting these DLL to register?
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>>>I am not sure, if this would be helpful or not, but as far as I remember, Filer.dll is msvcr71.dll and msvcp71.dll dependent
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>>These two are also included in the setup application, and they too fail to register.
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>The msvcr71.dll and msvcp71.dll are not COM DLLs and cannot be registered. What folder do you install them into?

Thanks, My INNOsetup was trying to register all the DLL, not just the Filer.dll.