Ok maybe
ahmetgns can help with your turkish.
Recuva is an 'un-deleter/deleted file recovery' application, it works very well and displays the likelihood of being able to recover a certain file (e.g. if it's been over-written or corrupted)
Are you sure you're chat logs are encrypted Plus chat logs?
an encrypted Plus chat log is in the .ple format eg.
talktofrankbot@hotmail.co.uk.ple
upon opening it will ask for your password and then it will open in plus's chat log viewer
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