I have a plugin dll in the Wireshark epan folder. Will the plugin work in a new version of Wireshark by just copying it to the new epan folder?

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If the new version of Wireshark is a new dot-dot release - for example, if you have it in the epan folder of Wireshark 4.4.6, and you copy it to the epan folder of Wireshark 4.4.7 - it should work.

Otherwise - for example, if you have it in the epan folder of 4.2.12, and you copy it into the epan folder of 4.4.7 - it may work, but there is no guarantee that it will work.