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> declare DLL_TYPE_BYTE _OWersja(DLL_TYPE_LPCSTR cfile1, DLL_TYPE_LPCSTR cfile2) in WinIP.Dll

This is not FiveWin syntax. What is it ?

this is

DLL32 FUNCTION _OWersja(cFile1 AS LPSTR, cFile2 AS LPSTR ) AS WORD PASCAL LIB "WinIP.Dll"

if function _toupper() this the same function toupper() from ctype.h

> if function _toupper() this the same function toupper() from ctype.h

Yes, probably

if I try
char _toupper( char );
I get worning

unresolved external symbol '__toupper'

Then try with toupper() without the underscore