Revert "Merge pull request #18 from knaou/master"

This reverts commit 0ebb4d1, reversing
changes made to 3acf521.

vbac.wsf

@@ -50,7 +50,6 @@ var xlExcel9795 = 43; //.xls 97-2003 format in Excel 2003 or prev
 var xlExcel8    = 56; //.xls 97-2003 format in Excel 2007
 var xlExcel12   = 50; //.xlsb
 var xlOpenXMLWorkbookMacroEnabled = 52; //.xlsm
-var xlOpenXMLAddIn = 55; //.xlam
 
 // AcNewDatabaseFormat
 var acNewDatabaseFormatAccess2000 =  9; //.mdb
@@ -599,12 +598,9 @@ Excel.prototype.createOpenFile = function(xlApp, path) {
     case 'xlsb':
         xlFileFormat = xlExcel12;
         break;
-    case 'xlsm': case 'xltm':
+    case 'xlsm': case 'xlam': case 'xltm':
         xlFileFormat = xlOpenXMLWorkbookMacroEnabled;
         break;
-    case 'xlam':
-        xlFileFormat = xlOpenXMLAddIn;
-        break;
     default:
         xlFileFormat = (vernum < 12) ? xlExcel9795 : xlOpenXMLWorkbookMacroEnabled;
         path        += (vernum < 12) ? '.xls'      : '.xlsm';