On my XP SP3 box, I happened on to a strange entry under HKEY_CLASSES_ROOT. The key was a single English word, and it had no default value, any subkeys, or even any values at all. I scrolled around a bit, and noticed a couple more. Here's a list:
also an and are be but by coordination far file. install installer. invasive keywords leaves more must Note of probably problem PROGID's, R6 R7 require so solve specific that There this thumbsup unaffected. uninstall using version ways would
I've left the capitalization exactly as I found it, as well as any punctuation that was included. My conjecture is that someone (or some thing) treated a chunk of English text as if it was a .reg file (perhaps by believing that it was possible to have comments in a .reg file).
I know I can safely remove these entries. The mystery (which might have no sensible answer) is how they got there in the first place. Any ideas?