The opcoinsounddemo.zip file you have requested: Half-Life 2 / Audio / OP:CO-IN Mod Sound Demo - 6.19MB 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.
An mp3 audio file showing off the great capabilities of OP:CO-IN's sound department.
Some really great weapon sound effects included!
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