THIS IS NOT FINAL... feel free to edit and add suggestions
Comments V2 is a feature form SF and it allows sending comments to people that have the file complete, it basically allows to send comments for arbitrary files the remote side have.
The packer was therefor altered by adding the file hast on the top:
[hast128 16] // file hash [uint8 1] // rating [string n] // comment
In the Mod Prot this alternated packet is to be send with the ModProt ID and under the same opcode as used usually.
 Compatibility Note
Mods > 0.48 should _not_ anymore ounce support for this alteration in the usual hello and also ignore if a never client sends v2, because it may be an official v2 that may be incompatible with the SF v2.