.swf
.fla
i have seen one, swf
i know its .fla
No, it is not possible to retrieve data loss from the flash memory using the USB extension cable.
.swf
flv
Yes, a faulty USB extension will eventually stop transferring data to the flash memory devices.
Depending on what kind of application you are creating, any saved Flash file itself has the FLA extension. The final produced output is either a SWF or a Projector EXE.
macromedia flash source file extension
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Flash isn't dangerous but allot of ads now a days use it. I suggest you keep it on and just you something like the Firefox extension ad-block to block ads.
To play swf files you will probably need an swf player. There are lots of freeware tools on the web which are rather good and easy in use.