OK, done. No viruses reported in any of the engines used (see below):

File:      ginstall.dll
Status:    OK
Packers detected:    None
 
AntiVir    No viruses found (4.17 seconds taken)
BitDefender    No viruses found (5.23 seconds taken)
ClamAV    No viruses found (13.23 seconds taken)
Dr.Web    No viruses found (11.83 seconds taken)
F-Prot Antivirus    No viruses found (0.64 seconds taken)
F-Secure Anti-Virus    No viruses found (7.81 seconds taken)
Kaspersky Anti-Virus    No viruses found (8.01 seconds taken)
Norman Virus Control    No viruses found (1.97 seconds taken)

So this does indeed appear to be a false positive. Nonetheless, I sent a copy of it to the email address above (virus(at)avast(dot)com), and I’d like final confirmation by someone who knows what they’re doing that this is safe.

Thanks for the response!

– Jeff

p.s. Why isn’t Avast in the above list?