SWC is zipped and when upzipping on a mac you get a folder not the swc

```
What steps will reproduce the problem?
1. download pngencoder.swc.zip on a Mac
2. double click
3. you get a folder with a swf inside.

What is the expected output? What do you see instead?
a swc

What version of the product are you using? On what operating system?
Mac


```

Original issue reported on code.google.com by `tallty...@gmail.com` on 10 Sep 2010 at 8:20
