Like Far Cry 4 or Metal Gear Solid Ground Zeroes for example, Dangerous Rays Steam version will be compiled in 64 bits. This mean increased performances and now the game will be able to allocate up to 8TB (yes terabytes, but anyway who have 8TB of RAM on his PC !) of memory instead of 3GB in the actual version. So your RAM sticks if you have more than 4GB of memory will be put to good use now !
More allocatable memory also mean that the game will be able to handle much more elements like more objects, more NPC's...
Be sure to have Windows 7 / 8 64 bits edition when the Steam version will be released as it will be required to be able to launch the game !
Stay tuned for more information in the near future about Dangerous Rays Steam version.