ciao, ho dei problemi a compilare un semplice script in C con Visual C++ 6.0

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#include <windows.h>

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
MessageBox (NULL, TEXT ("Ciaooo!"), TEXT ("HelloMsg"), 0) ;

return 0 ;
}
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lo compila perfettamente, ma quando faccio Build
mi da questo Errore:

Linking...
HelloMsg.obj : error LNK2005: _WinMain@16 already defined in ciao.obj
LIBCD.lib(crt0.obj) : error LNK2001: unresolved external symbol _main
Debug/ciao.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.

ciao.exe - 3 error(s), 0 warning(s)

potete aiutarmi??

grazie!