diff --git a/plugin/core/types.py b/plugin/core/types.py
index 8ae09bfb1..06710a094 100644
--- a/plugin/core/types.py
+++ b/plugin/core/types.py
@@ -855,7 +855,7 @@ def map_client_path_to_server_uri(self, path: str) -> str:
 
     def map_server_uri_to_client_path(self, uri: str) -> str:
         scheme, path = parse_uri(uri)
-        if scheme != "file":
+        if scheme not in ("file", "res"):
             raise ValueError("{}: {} URI scheme is unsupported".format(uri, scheme))
         if self.path_maps:
             for path_map in self.path_maps:
diff --git a/plugin/core/url.py b/plugin/core/url.py
index 024379105..1f6699f91 100644
--- a/plugin/core/url.py
+++ b/plugin/core/url.py
@@ -80,7 +80,7 @@ def _to_resource_uri(path: str, prefix: str) -> str:
 
     See: https://github.com/sublimehq/sublime_text/issues/3742
     """
-    return "res://Packages{}".format(pathname2url(path[len(prefix):]))
+    return "res:/Packages{}".format(pathname2url(path[len(prefix):]))
 
 
 def _uppercase_driveletter(match: Any) -> str:
diff --git a/plugin/locationpicker.py b/plugin/locationpicker.py
index 2802d5118..8fb390cf3 100644
--- a/plugin/locationpicker.py
+++ b/plugin/locationpicker.py
@@ -47,7 +47,7 @@ def open_basic_file(
     if uri.startswith("file:"):
         filename = session.config.map_server_uri_to_client_path(uri)
     else:
-        prefix = 'res://Packages'  # Note: keep in sync with core/url.py#_to_resource_uri
+        prefix = 'res:/Packages'  # Note: keep in sync with core/url.py#_to_resource_uri
         assert uri.startswith(prefix)
         filename = sublime.packages_path() + url2pathname(uri[len(prefix):])
         # Window.open_file can only focus and scroll to a location in a resource file if it is already opened
diff --git a/tests/test_url.py b/tests/test_url.py
index 9d782418a..31a06556f 100644
--- a/tests/test_url.py
+++ b/tests/test_url.py
@@ -62,7 +62,7 @@ class MultiplatformTests(unittest.TestCase):
 
     def test_resource_path(self):
         uri = filename_to_uri(os.path.join(sublime.installed_packages_path(), "Package Control", "dir", "file.py"))
-        self.assertEqual(uri, "res://Packages/Package%20Control/dir/file.py")
+        self.assertEqual(uri, "res:/Packages/Package%20Control/dir/file.py")
 
     def test_buffer_uri(self):
         view = sublime.active_window().active_view()