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While importing i get this error - Only files of these MIME-types are allowed…

This happens because the application does not recognize the mime type of the file you try to upload which mainly happens when the program you used to generate the file does not set a correct mime type.
In order to skip this error, you can go to Backend > Settings > Import/Export and set the Check Mime Type option to No instead of Yes.

Screenshot 2016-08-18 20.14.47