@hopper_d
You lost the CD, eh? o/~ Things that makes you go, hmmm ... o/~
Seriously now though, that's an InstallShield patch file, unless, you have the right tool (it's available if you look for it) to open the CAB files and extract the new files with which to replace the current game files, your best bet is get a hold of an original cd, and this time, try not to lose it and/or backup the original exe for future patches, etc.
Good luck.