Filter jpeg files in MACOSX

How can I filter the files created by the application Preview and saved as JPEG? According to the Rev documentation I should use either there two commands:

   answer file "SELEZIONA" of type "JPEG"

   answer file "SELEZIONA" with filter "JPEGs,*.jpg"

Unfortunately both of them do not work .As far as I know, the first one does not work because the application Preview from Apple does not set the filetype to JPEG even if you choose to save the image as JPEG. (crazy)

The second one does not work because even if the file has the extension .jpg, in the contextual menu the extension of that file disappear.
Why?

To me, this file type thing in MacOSX is a mess. _______________________________________________
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