Strong recommendation #1:  Turn that off right now!  Unless you have
unlimited space on your server, and you don't care how huge your backup is,
well, sure.. keep it on.   You have been warned.  If you want a better
explanation, this is from sms 2.0 but still applies, the "Collection Files
Taking Over" section:

http://www.faqshop.com/sms/swinv.htm

To answer your question, check on your server in inboxes\sinv.box\filecol.  
There will be a folder for each client that sent up a file, and there will be
multiples of each file as it was collected.  And you can't really tell from
looking at the folder which one belongs to which computer--you'll have to
write a report for that or look at the data from the console.

I'm going to assume that your goal was to be able to view client's log
files?  Which ones?  I can't believe you want every single log file that any
application could have ever dropped.  Perhaps we can recommend a better way
to get to your end goal.