The OpenFin Runtime version has 32-bit and 64-bit builds available. The OpenFin Runtime Version Manager will detect the O/S version and download the correct version.
When an OpenFin application is launched, if the required Runtime version is not available on the local system, the Runtime Version Manager (RVM)* will detect if the O/S version and download the matching Runtime Build.
*From RVM version 126.96.36.199, older versions will download a 32-bit Runtime
Both 64-bit and 32-bit variants of the Runtime are available from our Runtime Versions page. From the 'download' column, use the x86 link to download the 32-bit build, or x64 link to download the 64-bit build of any Runtime version.