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I've seen this sort of thing in other places, too. It looks like the work of a script rather than a person. Is this some kind of breakin attempt? Anyone had this happen before? Interestingly, I did a lookup of the IP address, and found that it belonged to an ISP customer in my area.
Well from this point of view it looks like legitimate traffic (just a normal GET-REQUEST). However for further information you probably should take a look at mod_security (www.modsecurity.org) and it's logging capabilities.
I get similiar log entries, except it reports the operating system and browser. The operating system is always "Windows 98" and the browser is always IE 5.5. It's a little strange, but doesn't seem to have any malignant effects.