I seem to remember MPLAB having huge problems with long file names up until very recently. Go grab the very latest free copy from Microchip.

I have made MPLAB compile with PBP sucessfully, and usually use the .cod file in my work too. Sorry, been a while since I set it up so I don't remember the secisics, just that it does indeed work.

Be advised, MCS may be a better authoring environment, as it highlights and jumps to problem lines (well.... sometimes, but that's another issue).