Same thing with Firefox as default browser. When I run it from the command line with the forward slashes in the path it doesn't realize it's a path and searches the web using the current search provider. With proper backslashes, it tries to open the file, but the `#` for the anchor name gets replaced with `%23` and so it can't find the file called `index.html%23editor-features-preferences`. With a proper URI (ie. with `file:///` and forward slashes) it opens fine from the command line.