Friday 20 May 2016

outlook 2010 this file cannot be previewed because there is no previewer installed for it

the attachment files with .dat extension in outlook 2010 email can not be previewed, error: this file cannot be previewed because there is no previewer installed for it.
Solution:
In Windows Explorer right-click any .dat file and select "Open With..." -> Choose Default Program. Select Windows Notepad there (not Notepad++) and make sure that you have the "default" check set.
Restart Outlook. Now it has to show you .dat files.

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