Yammy or Yahoo Messenger Archive Decoder will let you decode and view not only yours but, also others' stored YM conversations on your hard drive. It doesn't even require a password!
You can also export conversations into RTF or plain text format.
Usage:
Start the application.
Click open on the toolbar or select File > Open.
In the dialog that appears, navigate to your Archives folder and select a file to decode.
You should see the decoded contents on the screen.
If Yammy has trouble determining the yahoo-id, it'll prompt you for it.
Press Save to save it to a text or an rtf file.
Note:
The Archives folder is usually located at C:Program FilesYahoo!MessengerProfiles{YAHOO-ID}ArchiveMessages.
Yammy currently supports only instant messages and NOT conferences and mobile messages.
