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Running Win3.1 prog in WinXP

Is there any relatively easy way to convert a program that was written
in Windows 3.1 to something that will run in Windows XP? I have tried
running the "Translate DOS LW program" command, yet I still receive
"Undefined symbol" errors on DOS interrupt calls such as fopen, fseek
and fclose. I think that I may have rewrite these functions with their
32-bit file I/O equivalents since WinXP is no longer based on DOS like
Win3.1 was. Is there a tutorial out there that I've missed or does
anyone have any suggestions? Thanks a lot.
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