A platform update is available and will be applied automatically when Steam is restarted. The changes include:

Steam

Source MODs will now automatically appear in the games list Improved startup process for Steam Fixed crash when creating a backup that would span multiple DVDs Fixed a bug that would unnecessarily validate Steam caches after a cache corruption Fixed Condition Zero: Deleted Scenes and Codename Gordon failing to backup correctly Fixed a bug where the message "the game files will be deleted and re-acquired" would repeat Fixed offline mode failing after not connecting to Steam for more than a month

Half-Life 2

Optimization to the Steam filesystem to reduce game launch and level transition time

Source SDK

Simplified debug-launch process for MOD developers. MOD developers no longer need to place a config file in their directory Added a registry key for MOD developers to use to locate a user's Steam installation located at HKEY_CURRENT_USERSoftwareValveSteamSourceModInstallPath

STEAM