Check here:
Code: 
http://community.invisionpower.com/blog/1174/entry-4865-ipboard-310-dev-update-template-merge-center/
If you read what one of the real professionals on IPB skins says (Ehren on IPBForumskins) is that he recommends not to use this tool but instead reinstall the skin. From my personal point of experience I have to agree with Ehren.

If you anyway want to try this I highly recommend to test it first on a testboard as that might save you alot of headache if shit hits the fan so to speak.

Good luck...


/UpNorth