Maybe your .swfs need to be embedded in an HTML page to work? If they use external assets referenced by relative URLs the path is relative to the embedding HTML page (this used to cause some confusion).
If you really want to get them working you can try:
- Opening them in the debug player, maybe you'll see a trace that gives you a clue.
- Decompiling (with the right software this is often quite successful... 'Sothink' used to be pretty good) , opening in the Flash authoring environment and re-exporting.
- Trying older versions of Flash Player (Adobe still provides them for download)
If you really want to get them working you can try:
- Opening them in the debug player, maybe you'll see a trace that gives you a clue.
- Decompiling (with the right software this is often quite successful... 'Sothink' used to be pretty good) , opening in the Flash authoring environment and re-exporting.
- Trying older versions of Flash Player (Adobe still provides them for download)