Hello.

Here is a reddit thread where a user was dealing with the similar issue
https://www.reddit.com/r/armadev/comments/3yg2i2/arma_3_unusual_exit_code_0x0000409c_status_stack/

Might be worth checking it out and giving it a shot
tl;dr version
Backup and clear %localappdata%\Arma 3\ and Documents\Arma 3
Reinstall the game completely

hello,
same message for me and this solution doesnt work for me.
i can start the game in 32 or directly by the x64 icon