FileInfo
extension

HDX File - What is an .hdx file and how do I open it?

Learn about .HDX files and view a list of programs that open them.

Languages

EN

Overview

What is an HDX 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.

Popularity2.5/5

4 votes

Quick AppUsed by
VerifiedVerified by FileInfo.com The FileInfo.com team has independently researched the Delphi MultiHelp Index file format and Windows apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified. If you would like to suggest any additions or updates to this page, please let us know .

Document Icon

Breadcrumbs

DeveloperAutodesk
Popularity2.5 | 4 Votes

Previous / Next

‹ .HDV.HDZ ›

In-Depth

.HDX File Extension

Delphi MultiHelp Index File

DeveloperAutodesk
Popularity
2.5  |  4 Votes
 

What is an HDX 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.

Open over 400 file formats with File Viewer Plus . Free Download

Programs that open or reference HDX files

Sort

Pricing

Program Name

Platform

Reset

X

Windows

Autodesk AutoCAD 2025

Free Trial

Category: Misc Files

Updated: October 10, 2012

FAQ

What is an HDX 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.

Related