Hey there,
I'm having this issue scince two days after I restarted my computer. I already tried a couple solutions like reinstall DirectX, reinstall Visual C++ 2013 Redistributable, Verify the integrity of the game cache using Steam, backup Windows 10 to an older version and used Dependency Walker on Arma3_x64 where nearly every file showed an error (entry point - not bound).

When I try to start the game from the launcher with the 64- bit version it crashes (0xC000012F - STATUS_INVALID_IMAGE_NOT_MZ). But when I start it with the 32-bit version it works.
Besides this, when I try to launch the game from a modded launcher it crashes with 64- and 32- bit version. I really don't know what to do anymore...
I hope you can help me to find a solution.
Greetings from germany,
Michel.