This is from the archive but may be helpful: Error 65 _WINPROC 0345 when clicking a customized window Entry Type: Informational Product: Sage MAS 90 ERP, Sage MAS 200 ERP Application: Custom Office Version Reported: 4.20 Subject: Error 65 _WINPROC 0345 occurs when clicking on any part of a customized window. Possible Resolution: The custom .lib file may be damaged. Restore the ..\Mas90\xx\Custom folder from the last good backup (xx = module code where the error occurred. For example ..\Mas90\So\Custom).
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