Hi Mike,
Actually, the emailed PDFs are stored in a directory called Softmail and are deleted when the emails are cleared out of the queue. The PDFs stored in the SoftPDF directory permanently are those created when you enable an ePrint option to 'archive PDF customer copy', used for inquiry lookup and attaching to statements. These are identical to the emailed PDF to the customer, but have to be saved in a common place with common naming convention in order to allow the program to find them. And finally, the Accounting copies of forms are stored in the ePrint 'audit report' directory you specify, in a 'Forms' sub-directory. The latter two are only available with ePrint.
The Keep Accounting Copy PDF is typically not the same spec - as is purpose is to provide a separate document with different information than what is sent to the customer. Because emailing only creates the PDF with the first copy of a multi-copy specification, Keep Accounting Copy can store an additional copy with differing internal information.
It's not really the same invoice, and to store slightly different copies in the same location would be potentially confusing.
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Regards,
Softrak Tech Support