Beginner needs to know how to open a .fla file

I downloaded a open source flash game (puzzel) and it said to open it and change image if you wanted to. Well the file ends on .fla and the program Swish that I have don’t recognize it. What to do?

Well, that’s normal if you use Swish. You’re supposed to open them with Flash…\r\rpom 0]

fla is FLASH 5’s format. You can only edit .swf files with swish. Also if you want a more advanced program then turn to flash 5.