When I load the .blend file, everything in the scene is selected.
Click on the model name 'Game_engine' in the outliner,
so it selects all the pieces of the model, and it's pose.
Click the skeleton icon in properties
click Rest Position
Alt-R to reset rotation.
Hope that helps, if not, you might try Autodesk's tool
to convert it to a more recent .fbx file.
As a side-note:
The scene seems to have 2 lamps and 2 cameras with the exact same position.
You might delete the extra .001 for each of those, if they aren't needed.