Messenger Plus! Log-File Decrypter is a tool that helps you recover lost password for log files (.ple) encrypted by MSN Plus! Live. Encryption is done with a brute force attempt using the Log Viewer command line, which is supplied by MSN Plus itself.
This will open old messenger .ple log files *BUT YOU NEED THE PASSWORD*: archive dot org forwardslash details forwardslash MessengerPlusLive-Old.pleChatLogViewer (I couldn't post the url, download the zip file on the right) It's the Messenger Plus Log Viewer only, extracted from the Skype Plus install - which is able to open ancient ple files. Just saves people without Skype the hassle of installing it. This will open old .ple msn messenger files, and encrypted ones at that assuming you have the password. To archive log files as PDF, you could click print on each log, and use software like CC PDF Converter.