I don't know what they are, but if they are in your Documents and Settings/Username/Local Settings/Temp folder then it is alright to delete them.
I regularly clear my temp folder out, although I find that any files or folders created "today", (whatever todays date is), will not delete until tomorrow.
In my C:\Documents and Settings file is a Temp file containing many files with a XML extension.
Google says they are associated with PHP which is described as a server-sidded HTML embedded scripting language.
Question: What purpose do they serve on my run-of-the-mill Dell 4600 and can I delete them?