For a "native" desktop experience, these standalone players are highly recommended:
Ruffle is not just a standalone player; it is a Flash Player emulator written in Rust. It is the most modern approach to the "SWF player" search. swf+player+flash+file+viewer+best
Since Adobe blocked Flash content from running in browsers at the end of 2020, "viewing" a SWF file now requires standalone software rather than a web browser plugin. For a "native" desktop experience, these standalone players
You must download it from a trusted archive (like Internet Archive or official Adobe archived pages). Because it is legacy software, you should run it inside a sandbox or virtual machine for maximum security. For a "native" desktop experience