1. Fix EDKT451 It should append ".txt" to filename

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@1860 6f19259b-4bc3-4df7-8a09-765794883524

Tools/Java/Source/FrameworkWizard/src/org/tianocore/frameworkwizard/ToolChainConfig.java

@@ -380,6 +380,7 @@ public class ToolChainConfig extends IFrame implements ListSelectionListener, Ta
             int result = fc.showSaveDialog(new JPanel());
             if (result == JFileChooser.APPROVE_OPTION) {
                 currentFile = fc.getSelectedFile().getPath();
+                currentFile = Tools.addPathExt(currentFile, DataType.RETURN_TYPE_TEXT);
                 try {
                     vtcc.saveFile(currentFile);
                 } catch (IOException e) {