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So its more likely a installation error that it doesn't check that the file is newer, before overwriting it.
I haven't installed SP2 yet, but I have confirmed the browscap.ini file that it comes with is 32KB and only goes up to IE6 and Opera 4. Firefox isn't even mentioned. Neither is Safari. That's how old this file is.
So if you depend on browscap.ini please be sure you backup your existing copy before installing SP2 and then replacing it after the install. That's the semi-official workaround being suggested by my contact at MSFT. He blogged about it but I'm unsure if I can post a link to it.
The workaround as suggested by a programmer at MSFT is to either backup your file first or use a backup that's placed in %SystemDrive%\WINNT\$NtServicePackUninstall$\browscap.ini during the install.
There will be a KB article about this. Customer support has been made aware of what to tell customers.