--- a/dwt/program/Program.d	Sun Jun 08 15:11:48 2008 +0200
+++ b/dwt/program/Program.d	Sun Jun 15 22:32:20 2008 +0200
@@ -24,7 +24,6 @@
 import dwt.dwthelper.utils;
 
 import tango.sys.SharedLib;
-import tango.stdc.stringz;
 import tango.core.Exception;
 import tango.core.Array;
 import tango.text.convert.Format;
@@ -705,9 +704,6 @@
  * @param extension the program extension
  * @return the program or <code>null</code>
  *
- * @exception IllegalArgumentException <ul>
- *      <li>ERROR_NULL_ARGUMENT when extension is null</li>
- *  </ul>
  */
 public static Program findProgram(String extension) {
     return findProgram(Display.getCurrent(), extension);
@@ -718,7 +714,8 @@
  *       become public and the original method above can be deprecated.
  */
 static Program findProgram(Display display, String extension) {
-    if (extension is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
+    // DWT extension: allow null for zero length string
+    //if (extension is null) DWT.error(DWT.ERROR_NULL_ARGUMENT);
     if (extension.length is 0) return null;
     if (extension.charAt(0) !is '.') extension = "." ~ extension;
     int desktop = getDesktop(display);