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File received via e-mail has an extension of .dat

A file (QuickBooks company file, backup, portable file, accountant's copy or other file) received as an attachment in an e-mail has a file extension of .dat.

How to fix it
This is most likely an issue with the e-mail program/provider used to send or receive the e-mail. Some e-mail will change the file properties of an attachment and cause the .dat file extension to appear at the end of a file name.
 
Attempt to add change the .dat extension to the proper file extension and use the file as usual. For example, if the file is a backup, change .dat to .qbb and attempt to restore the backup.
 
If this does not resolve the issue, have the sender compress the file and e-mail it. If the sender cannot compress the file, have them e-mail the file again to see if it was a one-time issue that caused the .dat to appear on the file.
 
If the issue persists, have them send the file using a completely different method (like a cd or usb drive).
KB ID# SLN43490
12/5/2016 2:30:21 AM
PPRDQSSWS404 9138 Pro 2017 83ad22