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Archiver plugin – is a file of a dynamically loaded library, which uses extension acx32 or acx64 instead of dll.

The plugin can be used in the program, if it implements at least following functions:

ArcOpenW (or one of deprecated: OpenArchiveW, OpenArchive),

ReadHeaderExW (or one of deprecated: ReadHeaderEx, ReadHeader),

ProcessFileW (or deprecated ProcessFile),


ArcInitPluginW (or one of deprecated: SetChangeVolProcW, SetChangeVolProc).


Plugins support functions from earlier than 3.0 version, but their usage isn't advisable.