Wise Install Builder

An EviilPackage.exe created by Wise Solutions installer dumps 8 files in:
C:\TempFolder and executes one file C:\TempFolder\evil.exe which does some Bios queries and exists. On exit it deletes the entire folder C:\TempFolder.

I've extracted all 8 files and changed evil.exe to suit my needs, I want to replace evil.exe in the original package with the one I've modified...is there a way/tool to do this?

I don't prefer to build my own package from scratch as I'm not sure what else the install script does at this point (it could be doing more than extracting the 8 files to a tempfolder and deleting it after execution of evil.exe).

InstallBuilder has an option to 'Watch Application' and create a script but this feature is totally flawed as it detects some .tmp files and doesn't even detect the real .exe and dlls that the application actually extracts. The end result is a totally messed_up.exe.

Please help