The File Extensions Database


.NCX File Extension

  • Developer by: IDPF
  • Category: eBook Files
  • Format: XML

What is an .NCX file?

.NCX is EPUB Navigation Control XML File

Table of contents file created according to the XML-based Open Packaging Format (OPF) standard, which is part of the EPUB eBook specification; stores the document title and author, as well as the navigation points for the eBook; used as part of an overall .EPUB archive.

According to the Open Packaging Format 2.0 specification, NCX files should be created with a corresponding .OPF file, which contains the linear reading order and other eBook metadata.

NOTE: Since NCX files are saved in an XML format, they can be viewed and edited with a text editor.

Programs that open EPUB Navigation Control XML File
Windows
Adobe Digital Editions
Adobe InDesign CC 2019
Calibre
KDE Okular
Geometer Plus FBReader
Mac
Adobe Digital Editions
Adobe InDesign CC 2019
Calibre
KDE Okular
Geometer Plus FBReader
Linux
Calibre
KDE Okular
Geometer Plus FBReader

How to solve problems with NCX files

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