MBMediasays
As far as opening the file, it is flash CS3 +, so you’ll need CS3 or CS4 to edit it.
But there is no background in the swf, it’s just the stage color, which can be edited in the embedding in the HTML .
If you want to resize the stage, then you can do so with Flash CS3 or CS4 , if you don’t have that version then you can just download a free trial at the adobe website, it is limited to 30 days but it does not use any watermarks or anything, it’s fully functional and usable 
If you have any other problems just email me through my profile 

. I’m using it on one of my clients site here: 

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