I am a wireshark user and want to do some development to add new
protocol support from my side. But where are the dessector DLL files in
windows installation? I only find one wireshark lib file with name
"libwireshark.dll" and it is very huge of 38MB. Is it dessector support?
Yep, that's almost all the dissectors in that library.
There are also plugin dissectors which are in their own individual
libraries in someplace like: