diff --git a/ApplicationCode/Commands/RicFileHierarchyDialog.cpp b/ApplicationCode/Commands/RicFileHierarchyDialog.cpp
index 2b410142bf..efd80352ae 100644
--- a/ApplicationCode/Commands/RicFileHierarchyDialog.cpp
+++ b/ApplicationCode/Commands/RicFileHierarchyDialog.cpp
@@ -45,6 +45,7 @@
 #include <QAbstractItemView>
 #include <QMenu>
 #include <QTime>
+#include <QToolTip>
 
 #include <vector>
 #include <time.h>
@@ -569,6 +570,22 @@ void RicFileHierarchyDialog::setOkButtonEnabled(bool enabled)
     m_buttons->button(QDialogButtonBox::Ok)->setEnabled(enabled);
 }
 
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+void RicFileHierarchyDialog::warningIfInvalidCharacters()
+{
+    if (m_fileFilter->text().contains(QRegExp("[\\\\/:]")))
+    {
+        QToolTip::showText(m_fileFilter->mapToGlobal(QPoint(0, 0)), "File pattern contains invalid characters");
+        m_effectiveFilter->setText("(Invalid filter)");
+    }
+    else
+    {
+        QToolTip::hideText();
+    }
+}
+
 //--------------------------------------------------------------------------------------------------
 /// 
 //--------------------------------------------------------------------------------------------------
@@ -576,6 +593,7 @@ void RicFileHierarchyDialog::slotFilterChanged(const QString& text)
 {
     clearFileList();
     updateEffectiveFilter();
+    warningIfInvalidCharacters();
 }
 
 //--------------------------------------------------------------------------------------------------
diff --git a/ApplicationCode/Commands/RicFileHierarchyDialog.h b/ApplicationCode/Commands/RicFileHierarchyDialog.h
index e6c08d6720..05184f1474 100644
--- a/ApplicationCode/Commands/RicFileHierarchyDialog.h
+++ b/ApplicationCode/Commands/RicFileHierarchyDialog.h
@@ -87,6 +87,8 @@ private:
 
     void        setOkButtonEnabled(bool enabled);
 
+    void        warningIfInvalidCharacters();
+
 private slots:
     void slotFilterChanged(const QString& text);
     void slotFileListCustomMenuRequested(const QPoint& point);