I’ve had this bug lately, and if anyone else is having this, this post will teach how to fix it.
Say you just extracted armory yesterday, ran it, and it worked fine. But today, you tried to open armory, and it says something along the lines of " (insert file name).dll is not designed to work on windows" or something. When I opened the folder with armory, the erroneous file was empty. How you fix it is by going to the folder where blender (official version) is installed, and copy the file from Blender folder to the Armory folder, replacing the empty file. Armory ran a tad bit slow after that, but it worked nonetheless.