It's a Windows 3.x application that does not support long file names or those little labels that pop up over buttons. The PicStart Plus programmer is very good. I normally use the Cross32 Meta-Assembler. I used the same source file layout that I am familiar with when using the Motorola micros. Otherwise the PIC instructions can be related back to similar J1A instructions.
Microchip provide quite a bit of sample code which is very usefull when getting started.
I've been working from a print-out of the PIC16C71X data. It's a real pain. PDF files on screen are no good as regular references. To print a couple of manuals requires a ream of paper and an ink cartridge. The result weighs a ton and is difficult to use.