It looks like your shell is pushing the template before it gets to svn (in other words, the actual command that works, svn --username myusername propset svn:ignore Floating.swf Sunk.swf etc Try to include the template in single quotes so that your shell didn't do this.In addition, you need to apply this property to the directory, it looks like you want to use the current one, so . should work:
svn --username myusername propset svn:ignore '*.swf' .
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