--- a/php.nette2/src/org/netbeans/modules/php/nette2/Nette2FrameworkProvider.java	
+++ a/php.nette2/src/org/netbeans/modules/php/nette2/Nette2FrameworkProvider.java	
@@ -97,9 +97,9 @@ 
         if (!result) {
             FileObject sourceDirectory = phpModule.getSourceDirectory();
             if (sourceDirectory != null) {
-                FileObject bootstrap = sourceDirectory.getFileObject(Constants.COMMON_BOOTSTRAP_PATH);
+                FileObject bootstrap = getFileObject(sourceDirectory, Constants.COMMON_BOOTSTRAP_PATH);
                 result = bootstrap != null && !bootstrap.isFolder() && bootstrap.isValid();
-                FileObject config = sourceDirectory.getFileObject(Constants.COMMON_CONFIG_PATH);
+                FileObject config = getFileObject(sourceDirectory, Constants.COMMON_CONFIG_PATH);
                 result = result && config != null && config.isFolder() && config.isValid();
             }
         }
@@ -181,4 +181,20 @@ 
         return new Nette2CustomizerExtender(phpModule);
     }
 
+    /**
+     * Try to get a FileObject with correct filename case. See bug 238679.
+     *
+     * @param parent Parent FileObject.
+     * @param relPath Relative path, separated by slashes.
+     */
+    private FileObject getFileObject(FileObject parent, String relPath) {
+        File parentFile = FileUtil.toFile(parent);
+        if (parentFile != null) {
+            String nativePath = relPath.replace('/', File.separatorChar);
+            File file = new File(parentFile, nativePath);
+            return FileUtil.toFileObject(FileUtil.normalizeFile(file));
+        } else {
+            return null;
+        }
+    }
 }
--- a/php.symfony2/src/org/netbeans/modules/php/symfony2/commands/Symfony2Script.java	
+++ a/php.symfony2/src/org/netbeans/modules/php/symfony2/commands/Symfony2Script.java	
@@ -117,7 +117,13 @@ 
             // perhaps deleted app dir? fallback to default and let it fail later...
             return null;
         }
-        return appDir.getFileObject(SCRIPT_NAME);
+        File appDirFile = FileUtil.toFile(appDir); // #238679
+        if (appDirFile != null) {
+            File file = new File(appDirFile, SCRIPT_NAME);
+            return FileUtil.toFileObject(FileUtil.normalizeFile(file));
+        } else {
+            return null;
+        }
     }
 
     /**