| PC/MS-Windows pack. |  Actala - The Hero's Shadow Model 2148070 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Acting Lessons Model 1045520 | 2019 | Steam Valve Corp. |
| PC/MS-Windows pack. | Action - Source Model 977050 | 2019 | Steam Valve Corp. |
| PC/MS-Windows pack. | Action - Vengeance Model 2099940 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Alien - Prelude Model 773330 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Alien - Tropical Mayhem Model 810800 | 2018 | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Alien Model 382080 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Arcade Wrestling Model 1072100 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Ball 2 Model 1186340 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. |  Action Ball Demo Model 1875690 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Ball Model 1837160 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Card Football Model 848470 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Commando 2 Model 1646820 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Commando Model 1616690 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Entities Model 1046490 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Figures - Nitro Circus Model 791510 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Henk Model 285820 | 20?? | Steam Valve Corp. |
| PC/MS-Windows pack. | Action Legion Model 431630 | 20?? | Steam Valve Corp. |
| 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 Sandbox Model 1381650 | 2022 | 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 - Wonders of the World Model 1422630 | 2020 | 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. |
