The File Extensions Database

.NNT File Extension

  • Developer by: QUALCOMM
  • Category: Database Files

What is an .NNT file?

.NNT is Eudora Address Book File

Address book created and used by Eudora, an email client; stores contacts, such as names, nicknames, and email addresses.

NNT files, along with .TOC files, are located in the "EUDORA" directory.

NOTE: Eudora is no longer actively developed.

Common NNT Filenames

nndbase.nnt - Default name of the address book given by Eudora.

Programs that open Eudora Address Book File

How to solve problems with NNT files

  • Associate the NNT file extension with the correct application. On :
    Windows: Right click on any NNT file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.NNT files". Mac: Right click (or Ctrl-click) the NNT 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 .NNT is Eudora Address Book File. Because only the current version supports the latest NNT file format. Search, therefore, e.g. on the QUALCOMM manufacturer website after an available .NNT is Eudora Address Book File update.
  • To make sure that your NNT file is not corrupted or virus-infected, get the file again and scan it with antivirus software.