FCheck is a utility that comes with Maya. If you're on a Windows box, you can find a shortcut in your start menu (in the Maya folder).
More than likely, the reason why it's saying you don't have the appropriate program when you double-click the file is that there is no application associated to it. Easy enough to fix, though. Right-click the file and choose "properties." Then just navigate the "opens with" area and find FCheck. Now, you should be able to double-click .iff files from now on and they will open with the utility. If you don't want to associate .iff files with the FCheck utility (automatically every time), you could also right-click on your first file and choosing "open with..." and just browse to the FCheck Utility.
You could also just open up FCheck by itself and choose File > Open Animation. Then, select the first .iff in your rendered sequence. It will load everything and playback the animation.
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Last edited by NitroLiq : 15-05-2003 at 01:10 PM.