USE:

If you've already completed Cass' companion quest, and the Van Graffs are hostile to you:

Install the VanGraffHostilityFactionFix file.

Alternately (and this is a much cleaner option), don't install anything, but instead use the console
command "SetAlly 1b2a4 118368 1 1 ;Neutral" to return the Van Graff faction to neutral status with
the player. Note that on using the command, I believe Steam achievements will not register until
you've quit Steam entirely and logged back in, so if you care about that, use the command, save,
quit Fallout, quit Steam, then reopen everything.

If you have not yet completed Cass' companion quest:

Install the VanGraffHostilityQuestFix file.

Behind the scenes:

The Faction Fix file replaces the Van Graff Faction (which is now hostile due to completion of
Cass' companion quest) with the VanGrafFake faction. All Van Graff members are now members
of this new faction, which does not hate you. Ownership of the Silver Rush cell is transfered to
the VanGrafFake faction, so stealing will cause them to attack. Pissing off Jean Bapstiste or Gloria
should still cause the entire faction to attack. The Birds of a Feather quest can be completed
despite the faction change. When bringing Cass to Jean Baptiste, telling him "You shoot, you'll
regret it" will once again result in everyone trying to kill you (in the original version of the fix, it
did basically nothing, though the other two dialogue options worked just fine. The problem was a
missed SetEnemy call, and is now fixed). In fact, anything that sets the Van Graff faction hostile
SHOULD set the new faction hostile. There is also a single typo fix that, if you use the file
properly, you should never see. It's "bated" breath, Jean Baptiste, not "baited," unless someone's
been eating worms, perhaps.

The Quest Fix file does nothing more than comment out the script to set the Van Graff faction
hostile upon turning in the evidence. If anyone cares, it lives in the vMojave QUST critter, Form
ID 144122. Look under the Topics tab, and in vMojavevMORangerJacksonTopic018 (Form ID
15DA97), ending result script. Leaving this file installed will ensure that the quest will not turn the
Van Graff faction hostile on future playthroughs, so feel free to install it alongside the Faction fix
(if you need to/decide to use that critter) and just leave it on. They should be fully compatible.