The File Extensions Database

.EXT File Extension

  • Developer by: Symantec
  • Category: Plugin Files

What is an .EXT file?

.EXT is Norton Commander Extension

Software extension used by Norton Commander for DOS / Windows 95; allows users to modify files, such as change file attributes and synchronize directories, using a text-based interface.

File Type 2 Generic Email Attachment
Category: Misc Files

File that may be sent by an automated emailing script or program; uses the generic filename filename.ext (the file's name and "ext" for "extension"); may be a file created in one of many text or binary formats.

If you receive an EXT file as an email attachment, it is generally not clear what the file format is. Therefore, it is best to contact the sender of the email to determine the file format.

Many automated emailer code examples available on the Web use the generic string "filename.ext" when referring to the email attachment. Therefore, it's possible the script author did not replace the filename string with the appropriate attachment filename when sending the email.

How to solve problems with EXT files

  • Associate the EXT file extension with the correct application. On :
    Windows: Right click on any EXT file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.EXT files". Mac: Right click (or Ctrl-click) the EXT file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .EXT is Norton Commander Extension. Because only the current version supports the latest EXT file format. Search, therefore, e.g. on the Symantec manufacturer website after an available .EXT is Norton Commander Extension update.
  • To make sure that your EXT file is not corrupted or virus-infected, get the file again and scan it with antivirus software.