Reply to TSI Files changing to XML After upload

Hello I noticed in my comment tread below a mapping I uploaded recently
( https://maps.djranking s.com/mappings/1700 ) that another DJTT user wasn't able to download the TSI File for the mapping.
I looked at the download and indeed the file has .xml extension. When I selected the file for upload I definitely clicked on the TSI file and the upload seemed to be successful. But when you try and download it the extension has changed to .xml the file size is the same but the extension has changed.
I tried shortening the file name to see if that had any affect but without success.

What's the reason for the file changing it's extension after being uploaded to the site? Anyone know?

Cheers

Timmy