StartAllBack is a superior tool, thank you very much for it!
But for better user experience it could be great to allow users to change the corner shapes of top-level app windows. The default radius of rounded corners is 8 px (based on Windows 11 Geometry) which is too much, actually, as the Windows 7 should have got 5 pixels corner radius.
Could it by possible to use "DwmSetWindowAttribute function" for it? However I'm not sure if this function works for all kind of Windows (including UWP ones etc) or standard Win32 only. But if yes, applying the DWMWCP_ROUNDSMALL constant would change the rounded corner radius to 4 pixels only which would be so close to the Windows 7's 5 pixels corner radius and it would appear more nicely than default Windows 11's 8 pixels radius, IMHO. And for Windows 8.1/Windows 10 fans there would be possibility to disable rounded corners at all (appyling DWMWCP_DONOTROUND constant).
Please could you consider to add the feature mentioned above into your StartAllBack application? Thank you very much.