Microchip has released the source codes for PICkit 2. 

http://ww1.microchip.com/downloads/en/DeviceDoc/PICkit%202%20PIC18F2550%20Ve
r.1.0.1%202005-05-16.zip 

http://ww1.microchip.com/downloads/en/DeviceDoc/PICkit%202%20V1.00%20Source.
zip 

The source link of the product page is still broken. 
http://www.microchip.com/stellent/idcplg?IdcService=SS_GET_PAGE&nodeId=1406&
dDocName=en023805 



Regards, 
Xiaofan 

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