[Morglum007]

The program you need isn't any common uncompression utilities....Installshield installation system uses a diferent type of compression algoritm and u need special programs to open\handle it..
The program u need is ixcomp where x is 5 for old installshield installs(not useful TODAY for TODAY games)and i6comp for most installshield modern installations.....keep one thing in mind....to work with data1.cab,data1.hadr,data2.cab,data3.cab and so on u must copy it to ur hd AND remove the "read only" attribute.....handle it and set "read only" tick again or install will fail

Hope i helped u!