When extracting or having tags for a certain amount of time and application, they files may go corrupt or unusable. That's why you received the error.
I'd simply make a plane and shape it like a leave (by vert modeling it would be very fast, but don't focus on detail, just general shape).
You can animate and rig bipeds using 3ds Max, however, you are at the mercy of no render and some tools that make it easier to animate and model in 3ds Max. There are several tutorials I suggest looking up on Halomaps.org that feature Gmax being used as a rigging program for bipeds in Halo.
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