I'm so antiquated that I still use Notepad to edit my PBP programs! Also I use Notepad to edit programs in several other languages. It doesn't have any bells and whistles, but is quick and practical.

About installing MPLAB to the default place, that isn't possible, because for starters I run the whole PIC stuff on drive E:. Perhaps this is the reason why MPASM won't work. I do have the paths properly set up, but who knows what they do with them!

This whole thing is getting too problematic. I had hoped that someone could propose a simple PBP routine, using the 16-bit math provided in PBP, to do this 64-bit division. I will better continue in that line, rather than setting up a new programming environment, learning to use it, perhaps reformat and repartition my hard disk, to be able to use that assembly library!

The worst case is that I have to implement bitwise division in PBP, which would be rather slow and inelegant. Surely somebody has a better idea!