https://bugs.winehq.org/show_bug.cgi?id=58016
--- Comment #18 from Nikolay Sivov bunglehead@gmail.com --- (In reply to KRosUser from comment #16)
What is weird is that your "Open" dialog does not look like mine
It's not going to look the same in a clean default prefix, because it defaults to win10 version. You have to manually switch to winxp to get Office own dialog. But both dialogs worked fine here.