Files that contain the .ext file extension are most commonly associated with the Norton Commander software application. This application is primarily used on the DOS and Windows 95 operating systems.
Norton Commander allows a user to modify the files on their hard drive using a text-based interface. The files that are modified using the Norton Commander program are saved using the .ext file suffix.
The .ext file extension is also used for email text attachments by a variety of POP 3 email applications. When a user sends or receives an attachment using the email program, the attachment is saved using the .ext file suffix. This allows the user access to the file attachment without online connectivity.
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If you have additional information about the EXT file format or software that uses files with the EXT suffix, please do get in touch - we would love hearing from you.