Re-figure File.open_file handling of the file scheme.

lib/rdf/util/file.rb

@@ -297,7 +297,6 @@ def http_adapter(use_net_http = false)
     # @yieldreturn [Object] returned from open_file
     # @raise [IOError] if not found
     def self.open_file(filename_or_url, proxy: nil, headers: {}, verify_none: false, **options, &block)
-      filename_or_url = $1 if filename_or_url.to_s.match(/^file:(.*)$/)
       remote_document = nil
 
       if filename_or_url.to_s.match?(/^https?/)

spec/util_file_spec.rb

@@ -98,6 +98,17 @@
       expect(r).to be_a(RDF::Reader)
     end
 
+    it "yields a file scheme" do
+      path = fixture_path("test.nt")
+      path = Gem.win_platform? ? "file:/#{path}" : "file:#{path}"
+      r = RDF::Util::File.open_file(path) do |f|
+        expect(f).to respond_to(:read)
+        opened.opened
+        RDF::Reader.new
+      end
+      expect(r).to be_a(RDF::Reader)
+    end
+
     it "raises IOError on missing local file" do
       expect {RDF::Util::File.open_file(fixture_path("not-here"))}.to raise_error IOError
       opened.opened