what program can b used 2 open a file with the xtension- FILENAME.MIX

i recently downloaded a file from my mate. the file name ended up with extension .mix.
"filename.mix"
now what prog can b used to open dat file. when i just highlight it i can c a small window / preview of d pic in any window under the pic's description on d left hand side of d window. i used MS paint but dat doesnt work eitha....
plz help

.MIX Multilayer Picture File (MS PhotoDraw 2000 & MS Picture It!)
That should help you out:D

here's a site you can reference for unknown file extensions, pretty comprehensive
Whatis.com