Done! Didn't know swf can be played on Linux.
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It depends. See https://github.com/lightspark/lightspark/issues/339 as regards AVM versions (that's Actionscript Virtual Machine of course).
Also: "SWF v7 features and some SWF v8 and v9; SWF v10 is not supported by GNU Gnash." -- https://www.gnu.org/software/gnash