To get Adobe Photoshop to run by right clicking in Finder, I created this applescript program in Automator as a service to "Open Files and Folders" using application "Finder":
on run {input, parameters}
set myFile to item 1 of input
set myFile to (myFile as text) -- necessary or else the alias fails
set the clipboard to myFile
tell application "Adobe Photoshop 5.0.2"
open {alias myFile}
end tell
--display dialog "Opening " & myFile
return input
end run