| PC/MS-Windows pack. |  Action Reactor Model 1076980 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Rush Model 758920 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Supercross Model 1339620 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Taimanin Model 1335200 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actionpaint VR Model 894360 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active and Operational Model 2385480 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Crowds Model 683050 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Mummy Model 1547900 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  Active Neurons - Wonders of The World Demo Model 1435740 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Neurons 2 Demo Model 1285710 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Neurons 2 Model 1274910 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Neurons Model 1168630 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Opposition Demo Model 2249260 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Opposition Model 2227960 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Active Soccer 2023 Model 2187300 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actraiser Renaissance Model 1393370 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Golf 3 Model 399180 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Golf Model 2183800 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Ice Hockey 2 Model 2152720 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Ice Hockey Model 2152710 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Soccer 2 Model 2152690 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Soccer 3 Model 285030 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actua Tennis Model 2152730 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actual Multiple Monitors Model 241680 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actual Sunlight Model 288040 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Actual Volleyball Model 972650 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Agency Tycoon Model 1298820 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Exitum Model 444990 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Infernum Model 1390070 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Infinitum Model 1234430 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Movere - Chapter 2 Model 840640 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Wars Demo Model 1792540 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ad Wars Model 1554050 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ADA - Além d' Aventura Model 1398200 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Ada and Cal Model 1719960 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | ADACA Demo Model 1821300 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adagio Model 1061430 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam - Lost Memories Model 1121590 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam - Robot World Model 1146210 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Adam and Eve - The Game - Chapter 1 Demo Model 465560 | 20?? | Steam Valve Corp. |
