diff --git a/python/GafferUI/ShowURL.py b/python/GafferUI/ShowURL.py
index 2e648750ed..ec6a6bb76e 100644
--- a/python/GafferUI/ShowURL.py
+++ b/python/GafferUI/ShowURL.py
@@ -58,6 +58,8 @@ def showURL( url ) :
 			# yet has no problem with opening the file itself. This
 			# means we can't support anchors in file URLs on Windows
 			# as we need to strip them to produce a valid file path.
-			url = url[7:].partition( "#" )[0]
+			url = QtCore.QUrl.fromLocalFile( url[7:].partition( "#" )[0] )
+		else :
+			url = QtCore.QUrl( url, QtCore.QUrl.TolerantMode )
 
-		QtGui.QDesktopServices.openUrl( QtCore.QUrl( url, QtCore.QUrl.TolerantMode ) )
+		QtGui.QDesktopServices.openUrl( url )
diff --git a/python/GafferUITest/ShowURLTest.py b/python/GafferUITest/ShowURLTest.py
new file mode 100644
index 0000000000..26fb97865c
--- /dev/null
+++ b/python/GafferUITest/ShowURLTest.py
@@ -0,0 +1,65 @@
+##########################################################################
+#
+#  Copyright (c) 2026, Pascal Andre. All rights reserved.
+#
+#  Redistribution and use in source and binary forms, with or without
+#  modification, are permitted provided that the following conditions are
+#  met:
+#
+#      * Redistributions of source code must retain the above
+#        copyright notice, this list of conditions and the following
+#        disclaimer.
+#      * Redistributions in binary form must reproduce the above
+#        copyright notice, this list of conditions and the following
+#        disclaimer in the documentation and/or other materials provided with
+#        the distribution.
+#      * Neither the name of John Haddon nor the names of
+#        any other contributors to this software may be used to endorse or
+#        promote products derived from this software without specific prior
+#        written permission.
+#
+#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
+#  IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+#  THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+#  PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+#  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+#  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+#  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
+#  OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+#  WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
+#  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+#  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#
+##########################################################################
+
+import sys
+import unittest
+import unittest.mock
+
+import GafferUI
+import GafferUITest
+
+from Qt import QtGui
+
+
+class ShowURLTest( GafferUITest.TestCase ) :
+
+	def testWebURL( self ) :
+
+		with unittest.mock.patch.object( QtGui.QDesktopServices, "openUrl" ) as openURL :
+			GafferUI.showURL( "https://www.gafferhq.org" )
+
+		openURL.assert_called_once()
+		self.assertEqual( openURL.call_args[0][0].toString(), "https://www.gafferhq.org" )
+
+	@unittest.skipUnless( sys.platform == "win32", "Windows-specific URL handling" )
+	def testLocalFileURL( self ) :
+
+		path = "C:/Program Files/Gaffer/doc/gaffer/html/index.html"
+		with unittest.mock.patch.object( QtGui.QDesktopServices, "openUrl" ) as openURL :
+			GafferUI.showURL( "file://" + path + "#section" )
+
+		openURL.assert_called_once()
+		url = openURL.call_args[0][0]
+		self.assertTrue( url.isLocalFile() )
+		self.assertEqual( url.toLocalFile().replace( "\\", "/" ), path )
diff --git a/python/GafferUITest/__init__.py b/python/GafferUITest/__init__.py
index 117eeaeed7..a7c44a6ee5 100644
--- a/python/GafferUITest/__init__.py
+++ b/python/GafferUITest/__init__.py
@@ -93,6 +93,7 @@
 from .AuxiliaryConnectionsGadgetTest import AuxiliaryConnectionsGadgetTest
 from .MessageWidgetTest import MessageWidgetTest
 from .ModuleTest import ModuleTest
+from .ShowURLTest import ShowURLTest
 from .PlugLayoutTest import PlugLayoutTest
 from .ViewportGadgetTest import ViewportGadgetTest
 from .VectorDataWidgetTest import VectorDataWidgetTest