Shoutbox

You could try to decrypt them using a command-line and check if the output is right?

code:

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"%ProgramFiles%\Messenger Plus! Live\Log Viewer.exe" /Decrypt="C:\insert\path\to\mylog.ple" /Pwd="secret"

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Copy the .ple file to your desktop (so if something goes wrong you still have an original) and try that in a Run command. (Start > Run...) If you're on a 64-bit system, you might want to use %ProgramFiles(x86)% instead, or use the normal path (C:\Program Files (x86)\...).