Deploying the attached OSGi WAB works:

From the CLI:
deploy /Users/david/tmp/bundle-c.wab
Then open the web address in the browser: http://127.0.0.1:8080/osgi-webapp/simple?input=Hello
you will see some simple text output in the browser.

However, when changing the extension of the WAB to .jar the WAB doesn't work any more:
From the CLI:
deploy /Users/david/tmp/bundle-c.jar
However you'll get a 404 when trying to access the same WEB address as above.

OSGi WAB's are not required to have the .wab extension by spec and it's actually quite common that they simply have a .jar extension.