Currently MPAR is adding it's options to the registry when it is used the first time to play a file.
It does not add the options when the filter is registered in the system because this caused a problem during initial testing. Reason for the problem is unknown.

Because there are no options in the registry after installation, you can not configure MPAR in MP Configuration using the screwdriver icon (until you played at least one file).

Solution is to figure out why adding the settings to the registry when registering the filter did not work / froze the deploytool/nsis during first tests.