The VRC79xx does not save the Path to the Directory in the Airbeam.reg File
Article ID: 71664828
Using a \ as part of the path causes it to fail. After placing an Airbeam.reg file on the VRC79xx with a directory path, the path is left blank.
Use a / as part of the path instead.
Ensure that a / (forward slash), not a \ (back slash) is used to when indicating the directory path.