is it a Backwards Compatibility issue

Hi,
I have downloaded and installed Blender 2.49a onto my computer, and I am able to save my own work that I create in this version of Blender, but there seems to be a problem when opening Blender 2.48 files. For example, I have downloaded a chess game, which another member from BlenderArtist, had uploaded a link. You can find the thread over here…
http://blenderartists.org/forum/showthread.php?t=152250&highlight=chess

I believe the Blender version of this game was created in Blender2.48. However, when I tried to open it in Blender 2.49a, Blender 2.49a crashes. Whats even weirder is that I am able to append any of the scenes, objects, or mesh etc without causing Blender to crash, but when I try to save the appended file. Blender crashes. Has anyone else had this problem, and is there a work-arround for it?