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Conina on 02 April 2016
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Windows 10 64-bit (37%) is now the most popular OS at Steam, Windows 7 64-bit (33%) is second place.

If we count 32-bit and 64-bit versions together, Windows 7 is still in the lead with 40%, followed by Windows 10 with 38%.

Without Macs and Linux systems, the percentages are this:

Windows 10 64-bit (38.6%) is now the most popular OS at Steam, Windows 7 64-bit (34.5%) is second place.

If we count 32-bit and 64-bit versions together, Windows 7 is still in the lead with 41.7%, followed by Windows 10 with 40%.

DX10-incompatible systems (XP and older) are now only 2.13%