I am Confused...Help

Hi everyone,
This's my first post and Thanks to Wilders.org which is a GREAT Place for everyone who is novice at Security issues.
I am posting here for NOD32 ver 2.0 Updated until today...and I've scanned a file named "Mungabunga.exe" which has some Backdoor Trojan that my friend gave me. and NOD32 didn't detect it....but I have multiboot and i didn't even scanned and just opened the Folder containig that file...and Kaspersky showed that its infected by Backdoor Trojan. I KNOW it's affected with Trojan but i am CONFUSED why NOD32 didn't detect it when i NOD32 seems to be the BEST AV?
Please help me Thanks. and yes... My Heuristic are DEEP and I've set the AV to scan ALL Files. also AMON and IMON are active and its updated to 1.520. Thanks.

 

The best in AV detection( viruses) not trojans.
Two different matters.
I can reccomend that you use NOD with a good AT(anti trojan)
3 of the best are. Boclean, TDS and Trojan Hunter.

EDIT: Sorry forgot Welcome here.