I wasn't quite sure whether I should put it in "Support Forums", so I told myself it'd be ok to post my qestion here as well.
The matter is that I reinstall my Windows pretty often due to various reasons, and so obviously I'd be expected to reinstall the MxO too. But a while back I just tried and saw the game was working as it was, without any re-installation, and I wasn't experiencing any apparent troubles. That's why I thought: well, if I don't have to re-download all the patches, I'm more than fine with it.
But now I'd like to know now if there actually is any reason to re-install the game. Most of the other games I had worked quite bad without it, if at all.
Thank you in advance for your answers.