wine users - Dec 2010 - Victoria II Install Failure - installshield breaks

Backdata:
Game: Victoria II by Strategy First. Disc.
Wine: 1.3.8
Note: Game runs on all versions XP through 7, trying in both XP and 7 mode gives
identical behavior.
Terminal Error Output: Unavailable (Haven't figured out the syntax for
running a program on a disc in terminal)

When running setup.exe (autoplay always fails for anything, I find), it does the
InstallShield wizard, which will get somewhere between 20 and 60% done when an
error /such as/ (the error is not always the same) will occur (listed is the
most common):

An installation support file
'C:\users\theuser\Temp\{9C3B7F54-C6E2-4A74-9937-9C6EBA10C4A2}\_IsUser.dll'
could not be installed. (0x80070002)

Now, I've seen some interesting stuff all over for both _IsUser.dll and
0x80070002, but haven't found anything that really seems to help. Maybe I
just don't know enough to decipher it.

That said, can you provide any assistance?

As usual, find the solution to your own problem the minute you ask for help.

Saw someone else having a similar problem, and they realized that the way they
were mounting didn't mean anything to Wine, so with some modifications
I've now got it set up such that Wine knows what it's doing.
This problem, at least, is solved.

For anyone else having the same issue: Do not do a doubleclick mount, use:
sudo mount -o loop filepath pathwineknowstoseekcd

E.g. I use /media/cdrom0 as my disc drive in wine, so I did
sudo mount -o loop loldisc.iso /media/cdrom0

If you're wondering why I stated disc when my issue became related to it
being a poorly mounted .iso, it's because I ripped the iso myself (my cd
drive has a distressing habit of vibrating insanely) and thought I'd mounted
it correctly.