How to open a .GRP ladder file?

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I'm working on a retrofit controller for my Leadwell 550E VMC.  The tool changer is different on this machine than what comes setup in the new 3000M controller,  mine has a up down function for the umbrella style too changer.   I outputted the ladder file from the new 3000M controller and it came out as Ladder01.GRP.   Does anybody know what ladder program can open and edit this kind of file?  I tried RSlogix and AD's do more designer and neither worked.  I can open it with hex editor and it will display some of the I/O but cannot edit anyting meaningfully.  The ladder is 1600 lines of code and i can possibly edit it at the machine, but i really don't want to work through that long of a program standing at the machine.  


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