Check for a file to exist

Hi all, I have a script which returns the path for a file in this way:
set outfile to (choose file name with prompt "Choose output file." default name "out.iso")'s POSIX path
the path is then passed to the shell. Now, I want the script to check whether that file exists and if it does, the script needs to be stopped.
I tried some ways I found on the web but none seems to work.
Any help would be appreciated.
Thank you!
Lorenzo

Try using:
set outfile to (choose file name with prompt "Choose output file." default name "out.iso")'s POSIX path
set thefile to POSIX file outfile
tell application "Finder"
if exists thefile then
return --or other commands to stop script
end if
end tell
(57077)

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