sbmerge -ProjectDir switch

I was wondering if anyone out there was aware of what the sbmerge -ProjectDir switch syntax was suppose to be.

Its not listed in the thin app documentation or the blogs about submerge.

I have tried

sbmerge -ProjectDir "c:\path to thinapp\project name\executable" apply

sbmerge -ProjectDir="c:\path to thinapp\project name\executable" apply

sbmerge -ProjectDir \\computername\c$\path to thinapp\projectname\executable" apply

heck even tried sbmrege -ProjectDir -h

nothing works.

any ideas