@GenTollis Text: plain, HTML or markdown. I don't read or edit "doc" files, open or otherwise.
I am not *against* them, but personally it doesn't come up. But I also don't open attachments sent to me unless I requested them.
If folks are, um, enthusiastic in sharing weird files, I just let them know I can't open them, and to send text or equivalent. I just omit the fact I can't open them is on principle. ^_^