IE 5.5 SP2 does work (that's what I've been using). However, whether or
not "browseui" and "browselc" changed between IE 5.5, IE 5.5 SP1, and IE 5.5
SP2, I don't know for sure, but if I were a betting man, I would guess at
least one of them did.

Well let's see, I notice the file dates on those two files are 12/03 and
7/01, respectively (in my particular case), so presumably the "browseui" one
was upgraded a tad with SP2.

I think the browselc.dll file has stayed the same for all versions of IE 5.5.
The browseui.dll file has been modified by recent security updates, the latest one being MS05-014. The version of browseui.dll from that patch is 5.50.4948.700.