Look for the file name with a hyphen rather than a colon

client/lib/item.dart

Index: client/lib/item.dart
diff --git a/client/lib/item.dart b/client/lib/item.dart
index daf7b139ae51bd2b9fb546dfe489de61e876d8e1..3de72908645ab6c198f4e9be83ed06f13a51fdb2 100644
--- a/client/lib/item.dart
+++ b/client/lib/item.dart
@@ -410,10 +410,13 @@ abstract class LazyItem extends Item {
   LazyItem(String qualifiedName, String name, this.previewComment,
       [String comment]) : super(name, qualifiedName, comment);
 
+  /// The name of the file/url path we'll use to retrieve this item's data.
+  String get fileName => qualifiedName.replaceFirst(":", "-");
+
   /// Loads this [Item]'s data and populates all fields.
   Future load() {
     if (isLoaded) return new Future.value(this);
-    var location = '$docsPath$qualifiedName.json';
+    var location = '$docsPath$fileName.json';
     var data = retrieveFileContents(location);
     return data.then((response) {
       loadValues(JSON.decode(response));