Dear Alert7 , That means that if the user clicks on it using explorer.exe or iexplorer.exe the file won't be executed because even Microsoft Windows explorer is unable to parse the file? axo> Demonstration here: axo> Choose a malicious file which would be detected, such as nc.exe, axo> rename the file as nc??.exe (?? =Hex C0 D7 BA DC) axo> Because these special names are unable directly to input, so if you axo> want to run these file, you should use the following way: axo> Uses the MS-DOS name specification, we can operate file with Open、 axo> Read、Write、 and duplicate。 -- http://secdev.zoller.lu Thierry Zoller