| PC/MS-Windows pack. |  Cinderella Escape 2 Revenge Model 710030 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cinderella Phenomenon Model 568770 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Citadale - The Legends Trilogy Model 670410 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | City Builder Model 764550 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | City of Ages Model 688930 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Civil War - 1861 Model 540230 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Civil War - 1862 Model 532890 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Civil War - 1863 Model 436270 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Civil War - 1864 Model 699860 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Civil War - 1865 Model 620630 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Civil War - Gettysburg Model 665440 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clad in Iron - Gulf of Mexico 1864 Model 693450 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clad in Iron - Philippines 1898 Model 712970 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Clarent Saga - Tactics Model 709670 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Code 7 - A Story-Driven Hacking Adventure Model 650570 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. |  Code 7 - Episode 0 - Allocation Model 650710 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cognizant Protocol Model 664440 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colonial Defence Force Starfighter VR Model 433190 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Colorcode Model 671750 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Command - Chains of War Model 614130 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Command Ops 2 Model 521800 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Community Garden Model 692530 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Company of Heroes - Blitzkrieg Mod Model 681590 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Company of Heroes - Eastern Front Model 317600 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Company of Heroes - Modern Combat Model 341300 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Connected Hearts - Visual novel Model 603140 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Conquest - Frontier Wars Model 578670 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Constructor Classic 1997 Model 599600 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Containment Initiative Model 527700 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Contemporary Color Model 624650 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Corona Blossom Vol.3 Journey To The Stars Model 562480 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Counter Fight - Samurai Edition Model 593210 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crisis in the Kremlin Model 599750 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Critters - Cute Cubs in a Cruel World Model 717280 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Croneworld RPG Game CH1 Model 750710 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Crossout Model 386180 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | CS2D Model 666220 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | CTHON Model 595100 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cube-C - VR Game Collection Model 688910 | 2017 | Steam Valve Corp. |
| PC/MS-Windows pack. | Cur3d - Steam Edition Model 668660 | 2017 | Steam Valve Corp. |
