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emails with PDF files attached are being received as win.dat files

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emails with PDF files attached are being received as win.dat files

I write an email and attach the PDF files and send.  However, the receiver often receives only win.dat files instead of the PDF files.  This is particularly happening when being received on and I phone or I Pad.  Any ideas?  Thank you 

Silver Problem Solver

Re: emails with PDF files attached are being received as win.dat files

From Microsoft:

The data in a winmail.dat file is not usable. To resolve this issue, ask the sender to re-send the message in plain text format. The following methods can be used by sender to prevent sending Rich Text messages encapsulated in the Transport Neutral Encapsulation Format (TNEF).

Method 1: Change the default message format

The sender can change the format of the email messages that they send by using the following steps:  

  1. On the Tools menu, click Options, and then click Mail Format.
  2. In Compose in this message format, click to select Plain Text, and then click OK.