Ahh, okay. Then create a additional cab file with the two movie files inside on DVD1 next to sys.cab and zone.cab. You can create a Setup.ini with [ExtractSettings] next to Setup.exe for individual amount of cab files.
For example:
Code:
[ExtractSettings]
FreeArcFile1=sys.cab;DestDir:{app};Disk:1;
FreeArcFile2=zone.cab;DestDir:{app};Disk:1;
FreeArcFile3=movie.cab;DestDir:{app};Disk1; <-- new cab file with the two movie files inside
FreeArcFile4=movie1_us.cab;DestDir:{app};Disk:2;
FreeArcFile5=movie2_us.cab;DestDir:{app};Disk:3;
FreeArcFile6=movie3_us.cab;DestDir:{app};Disk:4;
FreeArcFile7=Data.cab;DestDir:{app};Disk:4;