It may have been a user education and/or communication issue. I had someone come to me recently asking for some data "in an XLS". I asked them if they specific

It may have been a user education and/or communication issue. I had someone come to me recently asking for some data "in an XLS". I asked them if they specifically need XLS or if they just need something that can be read by Excel. It was the latter, but they didn't know that there was a difference. To some people, XLS == Excel. Sort of like how TLS is still being referred to as SSL - somewhere in the world there is a developer being asked to use SSL for a new project because SSL == secure.