Did you searched the forum first? This was asked before several times though.
Anyways, you can use Messenger Plus!'s
Log Viewer tool (
LOG VIEWER.EXE) which exists in your Messenger Plus! installation directory.
This tool can also be used from the command line and can show log files (obviously), but can also re-encrypt and decrypt.
Use the parameter
/? on the command line to get some help and see the available commands and uses.
eg:
1) Start > Run > cmd
2)
C:\>"log viewer" /?
note the quotes, they are needed because of the space in the file name
--
Of course, doing this log by log takes a long time. And it becomes even more troublesome if you also want to decrypt all the logs in the subdirectories from the log directory.
For this purpose I've created a couple of batch files which automate this process: see "
CookieRevised's reply to About uncrypting logs (i've got password!)".