How to decode the content.proto file? (intermediate service)

I have downloaded a content.proto (intermediate service) from
https://traffic.tomtom.com/tsq/hdf/DEU-HDF-OPENLR//content.proto

The file seems the file is encoded. It looks something like

,64b70e5d-33f5-4d7a-a672-213de18bb8802f14806aTomTom Traffic Service$
PõÈØ GXT5¨
P@2% €?($
PõÈØ GXTU­
S;2% €?(%

How can I decode it?
Moreover, is the file normal?

It is Protocol Buffers format: https://developers.google.com/protocol-buffers