The File Extensions Database

.DMT File Extension

  • Developer by: DeLorme
  • Category: GIS Files
  • Format: Binary

What is an .DMT file?

.DMT is DeLorme Transfer File

Packaged project file created by DeLorme software mapping products such as Topo North America; saves a mapping project (.TPX file) but bundles it into a single file that can be used for sharing via email or online.

To import a DMT file in Topo North America, choose File → Transfer → Import.

Programs that open DeLorme Transfer File
DeLorme Topo North America

How to solve problems with DMT files

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