So first you must head file exlporer/This Pc/(find where you installed your games)/Program Files (x86), (or whatever you named your steam program folder when installing)/Steam/steamapps/common/Rome Total War Alexander. Now right click on "RomeTW-ALX," and the compatiblity tab shall now appear when you click properties.
I hope this helps anyone else who had the same problem. If this is a bit confusing I can edit this.
EnclaveAgent
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