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The 'mailto:' protocol does not specify attachments (bad for security!!)
It's preferable to post to a publicly available website any document(s) and provide a download link to the location.
You may need to rethink using mailto.
If you need HTML (formatted) email and multiple attachments, with FileMaker:
1. FileMaker plug-in
2. send to service
3. web publish (PHP, for example has a full featured set of routines for email, including creating documents to attach!)
4. AppleScript (?)