Slitherine

With the latest 5.2.0 update, we have upgraded Order of Battle to 64-bit. This allows us to make and include larger and more detailed scenarios. In short, it means support for a smoother gameplay and more complex maps.

Please refer to this thread for more information on the update.

If you are playing Order of Battle on a 64-bit system, you can now download the 64-bit updates. If you'd rather stay on a 32-bit system, you can choose to download and install the 32-bit updates from our Members' Area.

How do I know which I am running from Steam?

That is a good question and I am shocked you haven't had an answer in almost a year.

The opening screen of the non-Steam version displays wether you use 32 or 64 bit.
Checkt he bottom of the screen of the Steam-version.

Ahhh, thanks Eric. It is 64bit on mine.