yes. you can search several other sites. never underestimate power of google.

winpack is one of them GUI too. you can also try others like I6comp.
fxp://hobbes.nmsu.edu/pub/os2/win32os2/i6comp020.zip
I dont know if it works on Installshield 7 cab files.
you can use InstallShield CAB file Viewer, this should work.