Hi Dennis_S,
I found the solution. See below posted by someone else:
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I have found it. It seems that in Lion we had to convert the filename from Mac native to Posix format, in mountain lion this is no longer necessary. If you want to modify the script here are the instructions:
Finder->Applications. Right click on Aperture and choose "Open package contents"
Contents->Plugins. Open "Microsoft Outlook.applescript" (with the applescript editor)
You should see the following 3 lines:
-- convert the image path from UNIX to Mac
set this_imagefile_path to (POSIX file this_imagefile) as string
make new attachment at new_message with properties {file:(this_imagefile_path)}
these should be replaced with this line:
make new attachment at new_message with properties {file:(this_imagefile)}
You are not allow to directly edit this file so save a duplicate somewhere.
Rename the original script file.
Copy the modified file to the Contents->Plugins folder of the package. It has to be called "Microsoft Outlook.applescript"
You will probably be asked for your password a number of times.