sdx files are older drawings from earlier versions of OpenOffice.org and you can actually still find these files around and this makes many users wonder how to get these to some common format like JPEG, which is pretty much what sxd to jpg conversion represents.
he most convenient way is to simply download and install OpenOffice or similar OpenDocument based productivity suites and use the Draw app (it's always called that) to open and export .sdx files to whatever format you need and is supported.
Updated: July 28, 2023