Just in case you need to extract those passwords from mRemoteNG.  Just use the External tools as per the below.

1. Open mRemote and go to “Tools” > “External Tools”
2. Right-click in the white space and choose “New External Tool”
3. In the External Tools Properties, fill in a “Display Name”, “Filename” and some “arguments”.
   In this scenario I filled in "Password lookup", CMD and "/k echo %password%".
4. Go to the connection where you would like to reveal the connection and right-click on it and choose “External tools” > “Password lookup.