Further investigation on the issue I have, I have noticed at least one thing. A third party DLL which is bundled and used by the app seems to be a part of not working if the compatibility mode is not...

I have quite spend some time on what causing the issue but the original source and development environment is based on VC++ 6. So you can image anything can go wrong on the recent Windows...

Thank you guys for your replies.

I absolutely understand that I should fix the app. If I could, I'd have done it quite awhile ago.
The biggest problem is that it is not my decision but my...

I'm doing some research on an old application that I'm taking care of.
As of Windows 8, it works if the Windows compatibility mode is se to "Windows 7" and I confirmed it also works if I set the...