AutoHotkey Community

In that case, I would definitely recommend trying "SendInput" or "SendPlay" instead of just "Send" (those are direct replacements for the "Send" command.) They change the way the key is sent and may allow the key to be sent to the game correctly. (Worth a shot, anyway!)

If it does work, you can remove the "WinActivate" command and leave the "WinWaitActive" command. This will not make the game the active window, but will instead just wait for it to be active before it sends the key. (This will prevent F6 keys being sent to other windows.)

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