How to Open .DAT file on Mac or PC


.Dat file can be tricky to open on Mac or PC. Many software is outdated and opening with a text editor will give you strange results.

There is one way to do it using a browser software that works for .dat files on Mac or PC.

Here is the link for opening .dat files.

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  1. My DAT file shows 0 bytes so it's not working on the winmail site you provided. Any idea how I can solve that issue?

  2. It did not work for me, I am trying to open a .dat file that was dowloaded from this website , But when i open this file in notepad it dose not make sense Please leave a comment if anyone has idea about it.
    Thank you in advance.

  3. Result

    The file you uploaded does not seem to be a valid winmail.dat (TNEF) file. There are quite a few other file types with a .dat suffix. This service can open only the winmail.dat files.

    that's what I get


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