Ah, THREED.VBX, good times indeed.
Hahah, yes! I was obsessed with THREED.VBX, but because I was learning C at the time ended up writing a whole library of Windows custom-drawn controls that looked exactly the same. I guess it was only later that I learned there was nothing special about VBX libraries and that you could (with some boilerplate) make them work from C.
Kids nowadays have it so easy with their Electrons and QTs...
I remember when CTL3D.dll was all the rage.
Good times.
To think we used to worry about VB programs needing a separate runtime to distribute them and Delphi programs, while stand-alone, took up almost 200KB for a minimal app!