change %comspec% to cmd to make consistant

packages/dwg_trueviewer.xml

@@ -10,15 +10,15 @@
 	<check type="uninstall" condition="exists" path="Autodesk DWG TrueView %version%.*" />
 
 	<!-- decompression to a local folder (C:\temp\trueview) -->
-	<install cmd='%COMSPEC% /c rd /q /s %tmpdir%'>
+	<install cmd='cmd /c rd /q /s %tmpdir%'>
 		<exit code="any" />
 	</install>
-	<install cmd='%COMSPEC% /c start "" /wait "%WPKGSOFTWARE%\autodesk\dwg_viewer\DWGTrueView_%version%_Enu_64bit_dlm.sfx.exe" -suppresslaunch -d "%tmpdir%"'/>
+	<install cmd='cmd /c start "" /wait "%WPKGSOFTWARE%\autodesk\dwg_viewer\DWGTrueView_%version%_Enu_64bit_dlm.sfx.exe" -suppresslaunch -d "%tmpdir%"'/>
   <!-- start installation, on old machines this can take a long time -->
   <install timeout="8100" cmd='cmd /c start "" "c:\temp\Autodesk\DWGTrueView_%version%_Enu_64bit_dlm\Setup.exe" /q' />
   <install cmd='cmd /c %WPKGSOFTWARE%\wpkg\tools\waitforprocess.cmd Setup.exe' />
 	<!-- remove decompressed folder -->
-	<install cmd='%COMSPEC% /c rd /q /s %tmpdir%'>
+	<install cmd='cmd /c rd /q /s %tmpdir%'>
 		<exit code="any" />
 	</install>