Index: src/ch/ch.cpp
===================================================================
diff -u -r39864b5fbb931e3b257afbd60cfb7f36f71d146d -r607e0afdab47aafcab9f123a31869aa908164ce7
--- src/ch/ch.cpp	(.../ch.cpp)	(revision 39864b5fbb931e3b257afbd60cfb7f36f71d146d)
+++ src/ch/ch.cpp	(.../ch.cpp)	(revision 607e0afdab47aafcab9f123a31869aa908164ce7)
@@ -270,7 +270,8 @@
 	// ================================= Handle command line ==================================
 	// parse the command line this early, so we can support as much options as possible in the future
 	// (i.e. override the defaults used below)
-	m_cmdLineParser.ParseCommandLine(::GetCommandLine());
+	if (!ParseCommandLine())
+		return FALSE;
 
 	// ================================= Configuration ========================================
 	CString strPath;
@@ -457,6 +458,30 @@
 #endif
 }
 
+bool CCopyHandlerApp::ParseCommandLine()
+{
+	CString strError;
+	try
+	{
+		m_cmdLineParser.ParseCommandLine(::GetCommandLine());
+	}
+	catch (const std::exception& e)
+	{
+		strError = e.what();
+	}
+
+	if (!strError.IsEmpty())
+	{
+		CString strFmt;
+		strFmt.Format(_T("Error processing command line options. Reason: %s"), (PCTSTR) strError);
+		AfxMessageBox(strFmt, MB_OK | MB_ICONERROR);
+
+		return false;
+	}
+
+	return true;
+}
+
 void CCopyHandlerApp::InitShellExtension()
 {
 	// validate ch version against extension version
Index: src/ch/ch.h
===================================================================
diff -u -r1e687d59f0e622a610cbf97cf79febd12641d159 -r607e0afdab47aafcab9f123a31869aa908164ce7
--- src/ch/ch.h	(.../ch.h)	(revision 1e687d59f0e622a610cbf97cf79febd12641d159)
+++ src/ch/ch.h	(.../ch.h)	(revision 607e0afdab47aafcab9f123a31869aa908164ce7)
@@ -66,6 +66,7 @@
 	HWND HHelp(HWND hwndCaller, LPCTSTR pszFile, UINT uCommand, DWORD_PTR dwData);
 
 	void InitShellExtension();
+	bool ParseCommandLine();
 
 protected:
 	TShellExtensionClient m_tShellExtClient;