File Extension Library

.HDX File Extension

  • Developer by: Autodesk
  • Category: Misc Files
  • Format: Binary

What is an .HDX file?

.HDX file extension is created by Autodesk. .HDX has been classified as Misc Files. The format of .HDX file is Binary.

.HDX is Delphi MultiHelp Index File

Help documentation file used by older versions of AutoCAD design software; uses the filename ACAD.HDX and supplies an index for an associated ACAD.HLP (.HLP) file; not used by recent versions of AutoCAD.

List of all softwares that can open the Delphi MultiHelp Index File
Autodesk AutoCAD 2018

How to Open .HDX file on different platforms

Open .HDX File on Windows

  • Right-click a .HDX
  • Left-click "Open With" > "Choose another app"
  • Select the program that opens .HDX file and Select check box "Always use this app to open .HDX files" Press "Ok"

Open .HDX File on Mac

  • Right-click (or Ctrl + Left-click) the .HDX file
  • Click "Open With" > "Other.."
  • Then choose another program from the app list and press "Open"
  • Select check box "Turn on" for "Always open in app"

Open .HDX File on Linux

Right click on the .HDX file, choose "Open with" and select a program from the list above

Open .HDX File on iPhone

Select a file. If you don't see an application to open the .HDX file, tap "Share" and choose the right app.
Method 2
Save the file. Then open the app «Files». Touch and hold the file, then release your finger. You will see a black menu bar. After that tap "Share" and select an application.

Open .HDX File on Android

Tap the Settings icon on an Android smartphone, then select «Applications». Click the Settings icon in the upper right corner of the screen, to change the default apps.
If you want to open, edit, save or even convert .HDX files on Android, then your best bet is to download one of the dedicated apps available on Google Play.

How to fix problems with .HDX files

  1. You need to update the application that you normally use to open .HDX files. Only the latest version of the software supports the current .HDX file format
  2. You need to check the .HDX file for viruses. To do this, you need to scan it with a popular antivirus (Norton, Nod32, Kaspersky, Dr.Web, etc.)