Possibly harmful extensions of files that are attached to emails :
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   ADE Microsoft Access Project Extension 
   ADP Microsoft Access Project 
   
   BAS Visual Basic® Class Module 
   BAT Batch File 
   
   CHM Compiled HTML Help File 
   CMD Windows NT® Command Script 
   COM MS-DOS® Application 
   CPL Control Panel Extension 
   CRT Security Certificate 
   
   EXE Application 
   
   HLP Windows® Help File 
   HTA HTML Applications 
   
   INF Setup Information File 
   INS Internet Communication Settings 
   ISP Internet Communication Settings 
   
   JS JScript® File 
   JSE JScript Encoded Script File 
   
   LNK Shortcut 
   
   MDB Microsoft Access Application
   MDE Microsoft Access MDE Database
   MSC Microsoft Common Console Document
   MSI Windows Installer Package
   MSP Windows Installer Patch
   MST Visual Test Source File
   
   PCD Photo CD Image
   PIF Shortcut to MS-DOS Program
   
   REG Registration Entries
   
   SCR Screen Saver
   SCT Windows Script Component
   SHS Shell Scrap Object
   
   URL Internet Shortcut (Uniform Resource Locator)
   
   VB VBScript File
   VBE VBScript Encoded Script File
   VBS VBScript Script File
   
   WSC Windows Script Component
   WSF Windows Script File
   WSH Windows Scripting Host Settings File

   ZIP ( what is inside ? )
   
   and beware of the 'many spaces' trick....                      .exe