Information about the Unsafe File List in Internet Explorer

Warning

The retired, out-of-support Internet Explorer 11 (IE11) desktop application will be permanently disabled on certain versions of Windows 10 as part of the February 2023 Windows security update ("B") release scheduled for February 14, 2023. We highly recommend setting up IE mode in Microsoft Edge and disabling IE11 prior to this date to ensure your organization doesn't experience business disruption.

For more information, see aka.ms/iemodefaq.

Internet Explorer versions include an unsafe file. The purpose of the unsafe file list is to prevent you from accidentally opening a file type that could potentially cause problems on your computer.

Original product version:   Internet Explorer
Original KB number:   291369

More information

The Internet Explorer unsafe file list has been updated to be consistent with the Microsoft Office unsafe file list.

The complete unsafe file list in Internet Explorer is as follows:

  • .ade
  • .adp
  • .app
  • .asp
  • .bas
  • .bat
  • .cer
  • .chm
  • .cmd
  • .cnt
  • .com
  • .cpl
  • .crt
  • .csh
  • .der
  • .exe
  • .fxp
  • .gadget
  • .grp
  • .hlp
  • .hpj
  • .hta
  • .img
  • .inf
  • .ins
  • .iso
  • .isp
  • .its
  • .js
  • .jse
  • .ksh
  • .lnk
  • .mad
  • .maf
  • .mag
  • .mam
  • .maq
  • .mar
  • .mas
  • .mat
  • .mau
  • .mav
  • .maw
  • .mcf
  • .mda
  • .mdb
  • .mde
  • .mdt
  • .mdw
  • .mdz
  • .msc
  • .msh
  • .msh1
  • .msh1xml
  • .msh2
  • .msh2xml
  • .mshxml
  • .msi
  • .msp
  • .mst
  • .msu
  • .ops
  • .pcd
  • .pif
  • .pl
  • .plg
  • .prf
  • .prg
  • .printerexport
  • .ps1
  • .ps1xml
  • .ps2
  • .ps2xml
  • .psc1
  • .psc2
  • .psd1
  • .psm1
  • .pst
  • .reg
  • .scf
  • .scr
  • .sct
  • .shb
  • .shs
  • .theme
  • .tmp
  • .url
  • .vb
  • .vbe
  • .vbp
  • .vbs
  • .vhd
  • .vhdx
  • .vsmacros
  • .vsw
  • .webpnp
  • .ws
  • .wsc
  • .wsf
  • .wsh
  • .xnk