Index: magnolia-core/src/main/java/info/magnolia/freemarker/FreemarkerServletContextWrapper.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- magnolia-core/src/main/java/info/magnolia/freemarker/FreemarkerServletContextWrapper.java	(revision 39ae86d57615b753721054bb9ca1aae55d97664f)
+++ magnolia-core/src/main/java/info/magnolia/freemarker/FreemarkerServletContextWrapper.java	(revision )
@@ -60,8 +60,12 @@
 
 
 /**
- * Wraps the servlet context expecially for freemarker taglib resolution. This will trick freemarker TaglibFactory class
- * to "see" all jars in classpath as if they were jars in /WEB-INF/lib
+ * Wraps the servlet context especially for freemarker taglib resolution. This will trick freemarker TaglibFactory class
+ * to "see" all jars in classpath as if they were jars in /WEB-INF/lib.
+ *
+ * On Windows systems the implementation of getResourcePaths will return absolute paths including the drive letter. When
+ * freemarker then calls getResource and getResourceAsStream we must not call the wrapped servlet context because its
+ * not a valid URL and it will fail with a MalformedURLException. See MAGNOLIA-5651.
  */
 public class FreemarkerServletContextWrapper implements ServletContext {
 
@@ -77,7 +81,10 @@
     @Override
     public URL getResource(String path) throws MalformedURLException {
 
-        URL result = parentContext.getResource(path);
+        URL result = null;
+        if (path.startsWith("/")) {
+            result = parentContext.getResource(path);
+        }
         if (result == null) {
             // Trying the absolute path if the parent context fails.
             File file = new File(path);
@@ -90,7 +97,11 @@
 
     @Override
     public InputStream getResourceAsStream(String path) {
-        InputStream is = parentContext.getResourceAsStream(path);
+
+        InputStream is = null;
+        if (path.startsWith("/")) {
+            is = parentContext.getResourceAsStream(path);
+        }
         if (is == null) {
             // Trying the absolute path if the parent context fails.
             File file = new File(path);