In my case, recently upgraded to Poser 6 from 4 and using Mac OS X, MacConverter works in the OS 9 "classic" enviroment. My workflow is when I d/l something (usualy in a Poser DL folder), I run it though MacConverter and then place the files/folders in the correct Runtime location(s). Then I quit MacConverter and the Classic enviroment. Then I start up P6 and use the newly installed thing(s). Works fine for me. No crashes or anything. Heck, I even ran a d/l folder with a hundred or so different props, poses and figures in it. MacConverter didn't blink or get weirded out at all. BTW, to speed things up, I created an alias of Mac Converter on my OS X desktop and am able to drag and drop folders on it, which starts up Classic and then MacConverter. Although MacConverter isn't an OS X-savvy program, it does the job and until a OS X native proggie comes along, it's the only solution we Mac users have, afaik. hth