I use nowadays Opera because it just works for these swf -files. No other browser work.
However, the problem with Opera is that it is big.
Is there any tool by which you can just view SWF -files?
at https://www.adobe.com/support/flashplayer/debug_downloads.html Download the "Flash Player projector" at https://fpdownload.macromedia.com/pub/flashplayer/updaters/32/flashplayer_32_sa.dmg The second link will be updated. So use the first link.