fileType & creator

[-= JB =-]

I am creating a new file using the open file command.  I set the  
fileType after it
is opened then I write to the file and close it as seen in the code  
below.  I have
tried to use set the fileType and set the stackFileType as shown  
below but they
don't change the creator and file type.  Does anyone know the proper  
way to
write it so I can set the file type and creator when I create a new  
file?

     open file filePath for binary update
     set the  filetype to "RevoRSTK"
     --set the  stackfiletype to "RevoRSTK"
     put fld id 1009 into theFile
     write theFile to file filePath
     close file filePath

thanks,
-=>JB<=-