Hey there is a complete solution:-
1. Open winzip or winrar or right click the file you want to send.

2. then choose add to winzip\winrar.
3. you will see a dialog box contain the name of the file to be zipped.
4. for example the file is "rishabh.exe" winzip\winrar will show it in dialog box as "rishabh.zip"
5. rename the text in dialog box :- "rishabh.zip" to "rishabh.txt" and the file will convert itself to a text file.
6. DONE ! you can now send this file via e-mail