I recorded a tv show and now it won't play or even be able to edit it in nandub or virtualdub. But then I remembered that AVI_IO practically plays any file so I used that and it did play play it ...

Some files won't play, and others are extremely slow to open. One reader writes: "After installing QT 7.2, it is very, very slow opening .avi files that worked with the previous version of Quicktime.

Problems with AVI files -- fix Several readers have reported issues with AVI-formatted files after updating to QuickTime 7.2. Some files won't play, and others are extremely slow to open.