error LNK2001: unresolved external symbol _FtpFindFirstFileA@16

Problem:

Release 5.0:

Rebuilding         RELEASE\\FTP-UPRO.dll

   Creating library RELEASE\\FTP-UPRO.lib and object RELEASE\\FTP-UPRO.exp

FTP-UPRO.OBJ : error LNK2001: unresolved external symbol _FtpFindFirstFileA@16

RELEASE\\FTP-UPRO.dll : fatal error LNK1120: 1 unresolved externals

Rebuild complete with errors

This failure is related to CALL WINAPI "FtpFindFirstFileA".

Resolution:

In that case it was helpful to change the WINAPI call-convention from 74 back to 66 to resolve this external symbol as well while linking a DLL.