Refs #8942 - Fix link.

* Use QUrl::fromLocalFile to construct QUrl.
* Add error logging.

Code/Mantid/MantidQt/API/src/ScriptRepositoryView.cpp

@@ -520,8 +520,26 @@ bool  ScriptRepositoryView::RemoveEntryDelegate::editorEvent(QEvent *event,
   }   
 }
 
+/**
+ * Attempt to open the given folder link using an appropriate application.
+ *
+ * @param link :: the folder link to open.
+ */
 void ScriptRepositoryView::openFolderLink(QString link){
-  QDesktopServices::openUrl(QUrl(link));
+  const std::string error_msg = "Unable to open \"" + link.toStdString() + "\".  Reason: ";
+
+  // QUrl::fromLocalFile seems to be the most robust way of constructing QUrls on
+  // the local file system for all platforms.
+  const QUrl url = QUrl::fromLocalFile(link);
+  if( !url.isValid() )
+  {
+    g_log.error() << error_msg << "Invalid (malformed) URL." << std::endl;
+    return;
+  }
+
+  const bool openSuccessful = QDesktopServices::openUrl(url);
+  if( !openSuccessful )
+    g_log.error() << error_msg << "Could not find directory." << std::endl;
 }
 
 } // namespace API