Passing a filename to the firefox browser causes it to replace spaces with `%2520` instead of `%20`.

I have the following HTML in a file called `myhtml.html`:

```
<img src="C:\Documents and Settings\screenshots\Image01.png"/>

```

When I load `myhtml.html` into firefox, the image shows up as a broken image. So I right click the link to view the picture and it shows this modified URL:

```
file:///c:/Documents%2520and%2520Settings/screenshots/Image01.png
                    ^
                    ^-----Firefox changed my space to %2520.

```

What the heck? It converted my space into a `%2520`. Shouldn't it be converting it to a `%20`? 

**How do I change this HTML file so that the browser can find my image? What's going on here?**