% for wildcard
^ string must start with
type:type for filtering by type
chash:md5 for filter by contenthash
unnamed for files without filenames
communitynames for files with community filenames
encrypted for encrypted files
encrypted:KEY for encrypted by key
skit:soundkitid for searching by SoundKitID
range:start-end search within a specific set of FileDataIDs
vo:searchterm show sound files in which this dialogue appears

It is also possible to combine some of these options (but not others, it will complain) by separating them by a ,.
Examples: unnamed,type:wmo encrypted,creature,type:m2