+Constructs a URL object from the string. The URL must be valid according
+to RFC 1738. In particular, file URLs must be of the format
+{\tt file://hostname/path/to/file} otherwise \helpref{GetError}{wxurlgeterror}
+will return a value different from {\tt wxURL\_NOERR}.
+
+It is valid to leave out the hostname but slashes must remain in place -
+i.e. a file URL without a hostname must contain three consecutive slashes
+(e.g. {\tt file:///somepath/myfile}).