Files in Temp folder

What are the Perfilb_Perfdata_XXX.dat and IMTXXX.xml and IMTxxx.dtd files in this directory? I have two sets of perflib_perfdata_xxx.dat files. (The XXX's=numbers) One is a set of 11 files that dates all the way back into 2005. The other one is a single file made today 11-27-06. Same thing with the XML files. One is a set of4 files dated 11-19-06. The other is a set of 6 files dated today, 11-27-06. The DTD file is a single one dated 11-19-06. The rest of the files in this Temp direstory are tmp, txt, log and 3 MTX files. I'm asking because I thought I could delete anything in Temp directories, but when I sent tem all to the recycle bin a few days ago, I restarted the computer and checked the C:/documents and settings/ user name/local settings/temp directory and every sub-directory in was gone, including the Cookies, History, and Temporary Intermet Files directories. After restoring the recycle bin, the directories listed above came back. I have since been deleting the .tmp files a few at a time till they were gone. Now I'm down to the files listed above plus a DEL111.EXE, DEL112.EXE and a WAR.EXE file and some sub-directories for programs that were instaled(They should be ok to delete). But there are two sub-directories that have a Wrapper.EXE file in them.

My question is: Which files does this TEMP directory need so I won't delete them?