The fgd_ts2do_ep1.zip file you have requested: Utilities / Mapping / Half-Life 2: Episode One SDK Update FGD Upgrade - 239.05kb is not available. Perhaps try browsing all files for the game Half-Life 2 and upload any files you want to share or are missing. This is the only information we could locate:

The upgraded FGDs make mapping in Hammer more precise by providing more entities and keyvalues, as well as fixing many datatypes.

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