diff --git a/Modules/Wrappers/ApplicationEngine/include/otbWrapperInputProcessXMLParameter.h b/Modules/Wrappers/ApplicationEngine/include/otbWrapperInputProcessXMLParameter.h
index be5f9dc2154e8f13ebee5cefc1f14fb4dfa60112..1db4f6ecc2cacbee7ee630af05c5a61a0030b6cf 100644
--- a/Modules/Wrappers/ApplicationEngine/include/otbWrapperInputProcessXMLParameter.h
+++ b/Modules/Wrappers/ApplicationEngine/include/otbWrapperInputProcessXMLParameter.h
@@ -43,19 +43,10 @@ public:
   // Get Value
   //TODO otbGetObjectMemberMacro(StringParam, Value , std::string);
 
-  void SetFileName(std::string value)
-  {
-    this->SetValue(value);
-  }
+  bool SetFileName(std::string value);
 
   // Set Value
-  virtual void SetValue(const std::string value)
-    {
-    itkDebugMacro("setting member m_FileName to " << value);
-    this->m_FileName = value;
-    SetActive(true);
-    this->Modified();
-    }
+  virtual void SetValue(const std::string value);
 
   ImagePixelType GetPixelTypeFromString(std::string pixTypeAsString);
 
diff --git a/Modules/Wrappers/ApplicationEngine/src/otbWrapperApplication.cxx b/Modules/Wrappers/ApplicationEngine/src/otbWrapperApplication.cxx
index 8176e2f7ff99e11544d58e04538a2ecd1ff6a6f0..5f0075229d04e623830b7cdb3c9e2fd7717613ca 100644
--- a/Modules/Wrappers/ApplicationEngine/src/otbWrapperApplication.cxx
+++ b/Modules/Wrappers/ApplicationEngine/src/otbWrapperApplication.cxx
@@ -807,7 +807,8 @@ void Application::SetParameterString(std::string parameter, std::string value)
   else if (dynamic_cast<InputProcessXMLParameter*>(param))
     {
     InputProcessXMLParameter* paramDown = dynamic_cast<InputProcessXMLParameter*>(param);
-    paramDown->SetValue(value);
+    if ( !paramDown->SetFileName(value) )
+      otbAppLogCRITICAL( <<"Invalid XML parameter filename " << value <<".");
     }
 }
 
diff --git a/Modules/Wrappers/ApplicationEngine/src/otbWrapperInputProcessXMLParameter.cxx b/Modules/Wrappers/ApplicationEngine/src/otbWrapperInputProcessXMLParameter.cxx
index 87b94e868d178446e6996e216751dbb502300711..be17bb948f81ea97a661a1e7fb6165db44f0ccd3 100644
--- a/Modules/Wrappers/ApplicationEngine/src/otbWrapperInputProcessXMLParameter.cxx
+++ b/Modules/Wrappers/ApplicationEngine/src/otbWrapperInputProcessXMLParameter.cxx
@@ -41,6 +41,34 @@ InputProcessXMLParameter::~InputProcessXMLParameter()
 
 }
 
+bool
+InputProcessXMLParameter::SetFileName(std::string value)
+{
+  // Check if the filename is not empty
+  if(!value.empty())
+    {
+    // Check that the right extension is given : expected .xml
+    if (itksys::SystemTools::GetFilenameLastExtension(value) == ".xml")
+      {
+      if (itksys::SystemTools::FileExists(value.c_str(),true))
+        {
+        this->SetValue(value);
+        return true;
+        }
+      }
+    }
+  return false;
+}
+
+void
+InputProcessXMLParameter::SetValue(const std::string value)
+{
+  itkDebugMacro("setting member m_FileName to " << value);
+  this->m_FileName = value;
+  SetActive(true);
+  this->Modified();
+}
+
 ImagePixelType
 InputProcessXMLParameter::GetPixelTypeFromString(std::string strType)
 {
@@ -134,18 +162,6 @@ InputProcessXMLParameter::GetChildNodeTextOf(TiXmlElement *parentElement, std::s
 int
 InputProcessXMLParameter::Read(Application::Pointer this_)
 {
-
-  // Check if the filename is not empty
-  if(m_FileName.empty())
-    itkExceptionMacro(<<"The XML input FileName is empty, please set the filename via the method SetFileName");
-
-  // Check that the right extension is given : expected .xml
-  if (itksys::SystemTools::GetFilenameLastExtension(m_FileName) != ".xml")
-    {
-    itkExceptionMacro(<<itksys::SystemTools::GetFilenameLastExtension(m_FileName) << " " << m_FileName << " "
-                      <<" is a wrong Extension FileName : Expected .xml");
-    }
-
   // Open the xml file
   TiXmlDocument doc;
 
diff --git a/Modules/Wrappers/QtWidget/src/otbWrapperQtWidgetInputProcessXMLParameter.cxx b/Modules/Wrappers/QtWidget/src/otbWrapperQtWidgetInputProcessXMLParameter.cxx
index fbd32e34e91478248ee0c04cf75e70cf3aef6b08..d7b768675a679b271042869803d711ce4916b974 100644
--- a/Modules/Wrappers/QtWidget/src/otbWrapperQtWidgetInputProcessXMLParameter.cxx
+++ b/Modules/Wrappers/QtWidget/src/otbWrapperQtWidgetInputProcessXMLParameter.cxx
@@ -34,10 +34,13 @@ QtWidgetInputProcessXMLParameter::~QtWidgetInputProcessXMLParameter()
 
 void QtWidgetInputProcessXMLParameter::DoUpdateGUI()
 {
-  // Update the lineEdit
-  QString text( m_XMLParam->GetFileName() );
-  if (text != m_Input->text())
-    m_Input->setText(text);
+  if (m_XMLParam->HasUserValue())
+    {
+    // Update the lineEdit
+    QString text( m_XMLParam->GetFileName() );
+    if (text != m_Input->text())
+      m_Input->setText(text);
+    }
 }
 
 void QtWidgetInputProcessXMLParameter::DoCreateWidget()
@@ -85,15 +88,13 @@ void QtWidgetInputProcessXMLParameter::SelectFile()
 void QtWidgetInputProcessXMLParameter::SetFileName(const QString& value)
 {
   // load xml file name
-  m_XMLParam->SetValue(value.toAscii().constData());
-
-  // notify of value change
-  QString key( m_XMLParam->GetKey() );
-
-  emit ParameterChanged(key);
-
-  GetModel()->UpdateAllWidgets();
-
+  if (m_XMLParam->SetFileName(value.toAscii().constData()))
+    {
+    // notify of value change
+    QString key( m_XMLParam->GetKey() );
+    emit ParameterChanged(key);
+    GetModel()->UpdateAllWidgets();
+    }
 }
 
 }