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Blocked attachment types

Last updated on: 2021-07-05

This support document applies only to users who use the email system set up by MacWisdom Systems.

The following attachment types are frequently used by hackers to infect computers and to do harm. Because of that, they are rejected by the email system, and a "bounce" email will be sent back to the sender, letting them know the email was blocked and not received by the recipient.
Also, these attachment types may not be used in any email that is sent through the email system.

File type Full file name
ade Access Project Extension (Microsoft)
adp Access Project (Microsoft)
app Executable Application
asp Active Server Page
vaspx ASP.NET Web Page
asx Advanced Stream Redirector
bas BASIC Source Code
bat Batch Processing
cer Internet Security Certificate File
chm Compiled HTML Help
cmd DOS CP/M Command File Command File for Windows NT
cnt Index file for Windows help files
com Command
cpl Windows Control Panel Extension (Microsoft)
crt Certificate File
csh csh Script
der X509 Certificate
exe Executable File
fxpv FoxPro Compiled Source (Microsoft)
gadget Windows Vista gadget
hlp Windows Help File
hpj Microsoft Help Project File
hta Hypertext Application
htc HTML Component File
inf Information or Setup File
ins IIS Internet Communications Settings (Microsoft)
isp IIS Internet Service Provider Settings (Microsoft)
its Internet Document Set Internet Translation
js JavaScript Source Code
jse JScript Encoded Script File
ksh UNIX Shell Script
lib Static DLL Library Information File
lnk Windows Shortcut File
mad Access Module Shortcut (Microsoft)
maf Access (Microsoft)
mag Access Diagram Shortcut (Microsoft)
mam Access Macro Shortcut (Microsoft)
maq Access Query Shortcut (Microsoft)
mar Access Report Shortcut (Microsoft)
mas Access Stored Procedures (Microsoft)
mat Access Table Shortcut (Microsoft)
mau Access Shortcut Function
mav Access View Shortcut (Microsoft)
maw Access Data Access Page (Microsoft)
mda Access Add-in MDA Access 2 Workgroup (Microsoft)
mdb Access Application MDB Access Database (Microsoft)
mde Access MDE Database File (Microsoft)
mdt Access Add-in Data (Microsoft)
mdw Access Workgroup Information (Microsoft)
mdz Access Wizard Template (Microsoft)
msc Microsoft Management Console Snap-in Control File (Microsoft)
mht Web Page Archive File
mhtml Web Page Archive File
msh 3D Modeling File
msi Windows Installer File (Microsoft)
msp Windows Installer Patch
mst Windows SDK Setup Transform Script
msh1 Microsoft Help File
msh2 Microsoft Help File
mshmxl Microsoft Help File
msh1xml Microsoft Help File
msh2xml Microsoft Help File
ops Office Profile Settings File
osd Open Software Description File
pcd Visual Test (Microsoft)
pif Windows Program Information File (Microsoft)
plg Aston Shell Plug-in
prf Windows System File
prg Program File
pst Microsoft Exchange Address Book File, Outlook Personal Folder File (Microsoft)
reg Registration Information or Key for Windows 95 or 98 Registry Data File
scf Windows Explorer Command
scr Windows Screen Saver
sct Windows Script Component FoxPro Screen (Microsoft)
shb Windows Shortcut into a Document
shs Shell Scrap Object File
sys Windows System File
ps1 Windows PowerShell Script
ps1xm Windows PowerShell Script
ps2 Windows PowerShell Script
ps2xml Windows PowerShell Script
psc1 Windows PowerShell Script
psc2 Windows PowerShell Script
tmp Temporary File/Folder
url Internet Location
vb VBScript File or Any Visual Basic Source
vbe VBScript Encoded Script File
vbs VBScript Script File Visual Basic for Applications Script
vpb Visual Basic Project File
vsmacros Visual Studio .NET Binary-based Macro Project (Microsoft)
vss Visio Stencil (Microsoft)
vst Visio Template (Microsoft)
vsw Visio Workspace File (Microsoft)
vxd Windows Virtual Device Driver
ws Windows Script File
wsc Windows Script Component
wsf Windows Script File
wsh Windows Script Host Settings File
xnk Exchange Shortcut
xml Extensible Markup Language