jackstuff, ( oops, you only want 1 exe, then its only available in CIU V2 ( beta test ATM )
Make sure you set #define internal in BOTH scripts. Then in setup.ini you need this section ( if not there already ) IF you use compress.bat to make archives, if you just use the ISS script then that section shouldn't be there. Then you have 2 exe's, but you only want 1.
Code:
[ExtractSettings]
FreeArcFile1=Data1.cab;DestDir:{app};Disk:1;
FreeArcFile2=Data2.cab;DestDir:{app};Disk:2;