Zip bomb - Is this file part of Mac OS X installation? - bootroot.loader

(Please excuse my bad writing - my English isn't that good.)
Sophos AntiVirus (most recent version) warns me:
File Not Scanned (appears to be a 'zip bomb'):
Macintosh HD:System:Library:PrivateFrameworks:MediaKit.framework:Versions:A:Resources:MKD rivers.bundle:Contents:Resources:bootroot.loader
AppleCare says on a PowerPC Mac OS X there is no file like this by default - could only be a virus or could have been added by another (third-party) application.
I found a post on http://www.daniweb.com/techtalkforums/thread59657.html via Google. Someone seems to have the same problem - with a PowerPC Mac OS (Mac mini)!
I use an Intel Mac (MacBook). AppleCare was not able to tell me whether this file is part of the standard installation of an Intel Mac OS - are you?
Could you tell me if this file exists on your (Intel) Mac?
Can you tell me: Is this a zip-bomb - or not?
Thanks for help.
By the way: Sophos has never heard of this file.
Intel MacBook 1st generation Mac OS X (10.4.8)

Well, you could submit it to the virustotal.com site,
where
it can be scanned (for free) by all of the various
virus
scanners, and you could compare the results.
Great URL, thanks Russ! Hadn't known it, yet...
These are the results:
Complete scanning result of "bootroot.loader", received in VirusTotal at 12.16.2006, 07:49:16 (CET).
Antivirus Version Update Result
AntiVir 7.3.0.19 12.15.2006 no virus found
Authentium 4.93.8 12.15.2006 could be an archive bomb
Avast 4.7.892.0 12.15.2006 no virus found
AVG 386 12.15.2006 no virus found
BitDefender 7.2 12.16.2006 no virus found
CAT-QuickHeal 8.00 12.15.2006 no virus found
ClamAV devel-20060426 12.15.2006 no virus found
DrWeb 4.33 12.15.2006 no virus found
eSafe 7.0.14.0 12.14.2006 no virus found
eTrust-InoculateIT 23.73.87 12.16.2006 no virus found
eTrust-Vet 30.3.3254 12.15.2006 no virus found
Ewido 4.0 12.15.2006 no virus found
Fortinet 2.82.0.0 12.16.2006 no virus found
F-Prot 3.16f 12.15.2006 could be an archive bomb
F-Prot4 4.2.1.29 12.15.2006 no virus found
Ikarus T3.1.0.26 12.16.2006 no virus found
Kaspersky 4.0.2.24 12.16.2006 no virus found
McAfee 4920 12.15.2006 no virus found
Microsoft 1.1804 12.15.2006 no virus found
NOD32v2 1924 12.15.2006 no virus found
Norman 5.80.02 12.15.2006 no virus found
Panda 9.0.0.4 12.16.2006 no virus found
Prevx1 V2 12.16.2006 no virus found
Sophos 4.12.0 12.14.2006 no virus found
Sunbelt 2.2.907.0 11.30.2006 no virus found
TheHacker 6.0.3.132 12.14.2006 no virus found
UNA 1.83 12.15.2006 no virus found
VBA32 3.11.1 12.15.2006 no virus found
VirusBuster 4.3.19:9 12.15.2006 no virus found
Thanks a lot, folks! Problem solved: no virus, no zip-bomb.
MacBook 1st generation; PowerBook G4 12" Mac OS X (10.4.8)

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