exported image as jpg not readable on Mac

[Tiemo Hollmann TB]

Hello,

I am assigning PNGs from HD to an image in rev and export them as jpg.

This does only work on Win. When running the standalone on Mac 10.5
following happens after exporting:

The preview in finder shows the jpg ok, when opening with IPhoto, I can see
also the jpg, but when doubleclicking the jpg I see only the Hexcode of the
jpg and not the image. 

 

Is this a lack of Mac know how or a corrupted file export? But why is it
only not readable when double clicking?

Any ideas?

Thanks

Tiemo