I discovered that my itunes files are completely unorganized. I had things in different locations, etc. etc. So, in pruning duplicates and making things tidy, I discovered that scads of my files have apparently morphed from cute little "itune" files, with the little itune kind of log, into QuickTime files, with that icon view, instead. When you click on them, a quickTime program opens, too, not itunes. However, I can drag them onto itunes, and itunes plays them quite fine.
Any idea how/why this happened? And should I do anything about it?