If you use the command shell in XP, then you probably already use the TAB key for auto-complete. One new thing (to me anyways) is that this also works with wildcards, so you can type this:
Hitting TAB will cycle through all files that match the pattern, for this example, you get this:
This is match faster than what I was doing before:
Hitting TAB here, and you have to cycle through a dozen filenames that begin with K, before getting to the desired .sln file.