set filename in Applescript from RunRev, OSX

[R. Hillen]

Hello list,

in an AS-example of scripting mail.app on Mac OSX I found:

...
set theAttachment to choose file
...
make new attachement with properties {file:theAttachment} at after  
the last paragraph
...

I want to choose the file in a Revolution-Script  and use the choosen  
FilePath in the AS-Script by replacing "TheAttachement" with the  
FilePath:

So I put the AS-script into a field "MyScript" :

...
make new attachement with properties {file:theAttachment} at after  
the last paragraph
...

and wrote

answer file "what file to attach?"
put it into AttachFileName
replace theAttachment with AttachFileName in field "MyScript"
do field MyScript as Applescript

But it doesn´t work and I suspect, is is because a wrong form of the  
filepath.

May you help?

Thank you, Richard.