.YCHAT File Extension
Yahoo! Messenger Chat Log
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What is a YCHAT file?
Log file created by Yahoo! Messenger for Mac, an online chatting application; contains a log of the messages sent back and forth; saved with the current date and the contact in the filename; can be used for reviewing the conversation history.
YCHAT files are saved to the following directory in Mac: [user]/Library/Application Support/Yahoo! Messenger/Logs/.