pb
What is a .pb file?
application/x-protobuf
A .pb file holds Protocol Buffers binary data — Google's compact, schema-driven serialization where field numbers and wire types encode the message. Without the matching .proto schema the bytes are opaque, which makes it efficient but not self-describing.
How to use a .pb file
Use an example .pb file to test protobuf decoders (with the matching schema), wire-format parsing, and protobuf tooling.