It also works with a native K-Meleon agent if you just change the gecko version in it :cool: Try e.g. this one (guess NT5.1 is XP?):
Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.1.16pre) Gecko K-Meleon/1.6.0
For win98, and a german browser, and kernel-ex installed, I actually use this "custom" agent to get my "real default" agent transmitted
Mozilla/5.0 (Windows; U;
Win98; de-DE; rv:1.9.1.16pre) Gecko K-Meleon/1.6.0