* lisp/url/url-parse.el (url-generic-parse-url): Remove prefix /
when a file URI's filename starts with a single letter followed
by a colon and a slash or backslash.
(url-recreate-url): Mirror the change applied when parsing, so
the URL is recreated properly on MS-Windows.
* test/lisp/url/url-parse-tests.el
(url-generic-parse-url/ms-windows-file-uri-hanlding): New test.
(Bug#76982)
fec6e16f14