maya 6 files work in maya 5??
 

I cant seem to get files working in maya 5 that I made in 6?

It works (to a certain extent) if you save the Maya 6.) as an ASCII, open it in Word or Notepad or something, and just change the headings to "5.0" wherever it says "6.0." It sounds and is absurdly simple, so I imagine it only works for certain levels of information. but it's worth a shot!
good luck.

Just curious but, why do you want to step backwards on that?

because I can use maya 6 at work but I dont have a copy of 6 at home