Style.css still overwriting since 1.0.2
Please refer back to this issue:showthread.php?t=25557&highlight=style.css
style.css is a very common practice for web designers. Please rename your extension files differently so that they do not overwrite common files. It wouldn't be that hard for you to preface all your files with WA.
This is still an issue with DesignExtender 1.1.1