Issues with OS report

Hi All,
My apache logformat is as follows
APACHELOGFORMAT (%h %l %u %t \"%r\" \"Transaction time in Sec= %T\" \"Bytes
received = %b\" \"%{User-Agent}i\" %>s %I)
I am getting issue with the OS report.For Mac it works fine but in case of
Windows it is gives me unknown OS.
Below I have given the snippet let me know if I am doing something silly.

10.146.161.163 - - [28/Aug/2008:12:12:17 +0530] "POST
/spiral-bin/Collector.dll HTTP/1.0" "Transaction time in Sec= 2" "Bytes
received = 75629" "testApp/1.0; Win32" 200 117
10.146.163.57 - - [28/Aug/2008:12:14:07 +0530] "POST
/spiral-bin/Collector.dll HTTP/1.0" "Transaction time in Sec= 0" "Bytes
received = 263" "testApp/2.2; MacPPC" 200 124

In case of Win32 the report comes as unknown OS but it shows correctly for
MacPPC as Mac OS.

Thanks in advance.
Regards
Arnab

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