AppleScript: How to un-hide the file extension of a screenshot?
Solution 1:
You were close! You need to use file in front of (filePath as POSIX file), e.g.:
set filePath to "/Users/Me/Desktop/" & "Screenshot" & ".png"
do shell script "screencapture -mx -T1 " & filePath
tell application "Finder"
set extension hidden of file (filePath as POSIX file) to false
end tell