This is an Installscript MSI (argh). It actually repackages well with Admin Studio 6.0. This is the first valid test that i've found the to claim that A.S. 6 can convert IS MSI's to standard MSI's.
A further note:
When configuring the software for "multiuser", it asks for a unique name for this workstation to use. Whatever you input is added to the end of the shortcut in the following form (input TESTUSER during install):
[Network Drive\exe location] /n-TESTUSER
An easy workaround so that every workstation name is unique is to change the shortcut in the package to: