iTunes for Mac: Older media files may require iTunes to reopen in 32-bit mode

With iTunes 10.4 or later on OS X Lion, you may get the following alert when attempting to play some older media files:

"This movie requires QuickTime, which is not supported by this version of iTunes."

iTunes 10.4 or later on OS X Lion opens by default in 64-bit mode. However, some older media files in your iTunes library may still rely on QuickTime to play, and QuickTime only runs in 32-bit mode. In order to play media that encounters this issue, you will need to open iTunes in 32-bit mode first:

  1. In iTunes, choose Quit iTunes from the iTunes menu.
  2. From the Finder, choose Applications from the Go menu.
  3. Locate iTunes in the window that opens.
  4. Click the iTunes icon to select it. Then, choose File > Get Info.
  5. Enable the option to "Open in 32-bit mode." 
  6. Reopen iTunes.
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