Custom Print Processor Install Issue

[Steve]

We developed a custom print process based on the Winprint/Genprint. It has
worked on 32bit platforms without any issues for over 10 years now. We
recently attempted a X64 deployment of the custom print processor. Using
2003 WDK on a machine running Windows 2003 Server (32 bit) we built the IA64
bit dll. During installation of the IA64 dll the "AddPrintProcessor" fails
with error 193 and reports "unknown system error".

Just for a sanity check I compiled the WDK sample genprint print processor
and attempted to install it’s IA64 dll which failed with the same error.

I found Microsoft support article (#242395) and added to the linker flags
“/FIXED:no” which resulted in a larger DLL file and same install failure.

[Steve]

Solved the problem, the issue was that the 2003 WDK was creating w32X64 dlls
instead of wX64. Solved by using the 7.0.0 WDK.