Well, this is interesting. I have just tried to upload a .svg file and wordpress tells me:
” DUP_logo.svg Sorry, this file type is not permitted for security reasons.”
I am running WP 4.4 with an updated GP theme and pro plugin pack. Disabled all plugins without any change.
There are two very different responses to questions about this in wordpress forums, one common one involves hacking theme files and the other questioning the web host about permitted mime types.
Think I will just go back to trying to find the ideal size for my png …