Install Shield CAB Files

Does anyone know how to extract Install Shield CAB files (all types)? Universal extractor seems to be able to only extract IS6 CAB files and although ZipScan can extract most IS7+ CAB files, it requires that they have each have accompanying HDR files. The reason I need this is as follows: a while ago, Ubisoft released free, ad-supported versions of Far Cry, Prince of Persia: Sands of Time, and Rayman Raving Rabbids, and I downloaded all of them after Ubisoft stopped supporting any of them. When I try to install them, the installer gives me an "Internal Error". Unless anyone knows how to fix the "internal Error", then I figured I would try to extract the files and do a manual install. I've got the CAB files out of the EXE, and I've used ZipScan to extract the one with a partnered HDR file ( there are two CABs that the installer uses), but the other, having no HDR file and containing most of the game's content, is unnopenable with ZipScan.