Problem running sudokool in win xp sp-2 I downloaded the zip file of the sudokool. When I opened the zip archive using winzip and extracted the jar file an error occured. The log file of the error is as follows- Extracting to "C:\DOCUME~1\pku\LOCALS~1\Temp\" Use Path: no Overlay Files: yes warning [D:/Sudokool.zip]: extra 1 bytes at beginning or within Zip file (attempting to process anyway) Error in file #1: bad Zip file offset (Error local header signature not found): 1701 (attempting to re-compensate) Extracting Sudokool.jar Error: invalid compressed data to inflate I even tried to open the archive in zipzenius i an another P.C. It too gave a checksum error. What to do?