I had tried the root of C:\PBP3 but that did not work. I will try again, making sure I have the other files as well. PB20.bas will not compile and I get an assembler error if some of the other *.INC files (such as DEV_FAM.INC) aren't in the same folder. In other words, not only the .bas file is required, but other accessory files.

I create my own project file on another disk partition since I have so many different ones and versions of "same" programs. When I pointed to the path like this:
Include "c:\pbp3\pb20.bas" well that didn't work either. Now I had tried a number of things a couple different ways so I'll check to see if I just had bad combinations. At least I know not to put it in the Microchip folder.

I'm using the Microchip assembler (not MP) and to answer your question, the only file I include is PB20.bas, per examples given. The other INC files I mentioned are pulled in by this bas file.

thanks, i'll get back to you when it works.