Skype: merging chat history from Windows to Linux (.db to .lock)

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http://askubuntu.com – I am a beginner. I want to merge my Skype chat history from a Windows version, which comes in a file called "main.db" inside my personal folders, with my "main.lock" file, found in my hidden Skype folders on my home computer. I'm running Linux Mint and Ubuntu both on 32-bit 12.04. Alternatively, I may need to simply replace the current .lock file with a converted version of the older .db file - is there a way I can do this instead? Any help would be much appreciated. (HowTos)