How to use unpacking filter correctly?

[Jungle]

I have an archive with some files which have no extensions. How do i unpack them?
Filter "*." (without quotes) doesn't work.

[Mathias (Author)]

At the moment MultiCommander is only using the file extension to identify what archive format a file is.
(There are plans for auto detecting by trying to detect it by opening the file in the future)

If the file does not have any file extension you need to rename the file first to a name with a valid file extension.
if the file has a different file extension like .XZY but really is a zip archive. Then in the Extension Manager select the FSZip Plugin and in option add "XZY" is a file extension for that plugin.

[Jungle]

I mean that there are files without extensions INSIDE archive file, and i want extract them using filter but unable to do this.

[Mathias (Author)]

extension is need for filters to work if using wildcard.

But you can try to use exclude filter like example "-*.txt" to unpack everything except *.txt files.
so if you can match everything expect the extension less files you can exclude them and then only the extension less files will be unpacked.