open document file in Applescript

I have used the following line of script successfully:

open document file "NEAL'S LIBRARY.FP7" of folder "FILEMAKER 8 FILES" of folder "Documents" of folder "nealnt" of folder "users" of startup disk.

I recently moved files around as the file is no longer on the startup disk but on a HD labeled Macintosh

hd. I tried changing startup disk to Macintosh hd but this did not work. Error was: Expected end of line, etc. but found identifier.

So how should I change this line of applescript?

Thanks