Update on the situation: I tried something different, which worked (to some extent)! I opened up my project in the 32 bit version of VB 4, saved it, and apparently it converted the 16 bit ocx's to the 32 bit ones! At least, when I open the project in VB 6 now, the errors I get are related to 32 bit ocx; to be more specific, I get the "xpto.ocx could not be loaded- continue loading project?" error with the following files: spin32.ocx, grid32.ocx, threed32.ocx and graph32.ocx.
Any thoughts on how to get around this?