Yeah, I scoured the net a bit for you and no luck, at least, in getting anything to open it...
Opening the file in a hex editor shows 'FPIX' as the file header.
You see 'FPIX', 'DPIX' and 'XPIX'. So I googled around for details based on that:
http://docs.oracle.com/cd/E11882_01/appdev.112/e10776/ap_imgfmts.htm#AIVUG80590FPIX
extension: .fpx
mime: image/x-fpx
FPIX, or FlashPix, is a format developed by Kodak, Microsoft Corporation, Hewlett-Packard Company, and Live Picture, Inc., for storing digital photography.
But, after installing IrfanViewer (
http://www.irfanview.net/), and its plugins pack, software that supported the format, it would fail to recognize your particular file.
Since this is from a videogame, it's likely it's a custom format or a modified version of an official one. That means you'll have to learn Intel x86 Assembly, trace the game code to where the file is opened, and study the decoding code. That's a long, involved, difficult process unfortunately so it's not something anybody is gonna help you with, not unless they are fully committed and interested in translating that videogame with you and have lots of experience in hacking.
Good luck.