Applescript reading field to play quicktime problem

Hello,

New to the forum...(sorry if this is not the right spot for this question)...hoping I can get some newbie question help. I'm pretty sure the problem is to do with the paths and how they are handled...but...obviously I don't know for sure. I have a filemaker record that has a field in it called:

playbackPath

The value of that field is a unix path to a quicktime movie "/Volumes/UBA_RAID/prod/gen123/gen123.mov"

What I want to do, for many other convoluted reasons, is open the quicktime via applescript. Here is the script that I am using to do that...

tell application "FileMaker Pro Advanced"

set realPath to cell "playbackPath" of current record

end tell

set theMovie to (POSIX file realPath)

tell application "QuickTime Player 7"

activate

open file theMovie

end tell

I keep getting a can't get file error from applescript. I'm sure this is a simple fix to do with PSOIX, no? Many thanks for any help,

-Dexterama