Download a player like SWF File Player or Ruffle . Right-click your file and select "Open With" to choose the player .
: This is currently the gold standard for playing Flash content. It is an open-source Flash Player emulator written in Rust that runs natively in modern browsers via WebAssembly or as a standalone desktop app. It avoids the security vulnerabilities of the original Flash plugin. Adobe Flash Player Projector swf+player+flash+file+viewer+best
Lightspark has a slightly lower compatibility rate than Ruffle (approx. 70% of all SWFs work flawlessly), but for those that do work, performance is stellar. Download a player like SWF File Player or Ruffle