Some third party libraries that were shipped with VB6 and could be included during compilation may not be in the interest of Microsoft Support that too could bring serious issues in modern OS. There are more issues than that for example Data Connections(ODBC, ADO etc).
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Displaying a Form in Windows 7 and Windows 8 does not translate to full compatibility of VB6. A friend of mine had issues installing VB6 IDE on Windows 8 that’s when I learned that The Visual Basic 6.0 IDE is no longer supported as of Apby MS. My Notify Icon on System Tray used to hang in Windows 7 and vista even when I exit the app but works well in Windows XP. Some of the issues I have had with my old VB6 app in Windows Vista and Windows 7 is sockets communication, I think this is due to hardened security in Vista and Win 7. I have had a lot of problems with my Old VB6 App and immediately switched to C Sharp the learning curve was rather tiring though, but now I am very comfortable. It has to be said that VB6 isn’t fully compatible with Windows Vista and Windows 7 any other statement would be misleading.