The 51505151.exe file you have requested: Official Patches / Patch for HL:Initial Encounter v5.1.5.1 - 1.2mb is not available. Perhaps try browsing all files for the game Half-Life and upload any files you want to share or are missing. This is the only information we could locate:

5.1.5.0 to 5.1.5.1 Update

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