iTunes files

Once again iTunes opened up with a blank catalogue this time though I watched its folder.

It created an "iTunes Library.itl", then an "iTunes Music Library.xml" an "iTunes Library Genius.itdb" and finally an "iTunes Library Extras.itdb".

Then it created a "Temp File.tmp" and then an identically sized "iT.tmp" while at the same time deleting the "iTunes Library.itl" file. Despite this iTunes itself still displayed my music catalogue. Then I closed it down.

No itl file was created so I renamed the "iT.tmp". Reopened iTunes and my music was still all listed.

What the hell is going on?