When I saw the screenshot of the app I first thought, "that's Swing". But then I saw that tick mark and I thought, holy moley oculd that be the tick mark from Borland (e.g. OWL)? https://sourceforge.net/p/owlnext/wiki/Replacing_usage_of_BW...
When the 3D look became the norm for Windows apps, introduced by Office and, later, by Windows 3.1 (or 3.11), I used the DLL to 3D-fy my Windows app dialogs automagically. I also took some liberties with using Office graphic elements reasoning that a Windows or Office user would know the 3.5" floppy saves things.