It must of happened in a recent update or something, but when I try to export a file in Chrome all it does is try to download the .php file, however in Firefox it provides the correct tar.gz file.
I guess nobody monitors these issues here? But anyway, it seems this issue is not related to WP Migrate DB, it is a Chrome issue as I have also experienced it with others things as well.
It must of happened in a recent update or something, but when I try to export a file in Chrome all it does is try to download the .php file, however in Firefox it provides the correct tar.gz file.