Skype appears to make use of .db, .db-journal, and .lock files, in addition to subdirectories filled with .dat files for storing conversation histories.ces

Would be the formats of those files available anywhere, or perhaps is there a wide open source library for being able to access them will be able to examine and perhaps modify? I believe several libraries permit the retrieval of conversation history, but I must also achieve insertion of conversation history records.

They're SQLite databases.

You should use SQLite or perhaps a tool to determine its contents.

Also, the majority of the information can be obtained through Skype API (I know of COM and Java bindings)