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HDX HLP
Not possible

Convert HDX to HLP

Can you convert HDX to HLP?
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Is it possible to convert HDX to HLP?
No - not a direct conversion.

HDX is a companion index TO an .HLP, not a standalone document. They are not interconvertible; both are needed together for the WinHelp system.

No direct path
Also to HLP: GID

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Tested on macOS, Windows & Linux
Last verified Oct 2026

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Converting HDX to HLP

A .HDX file and a .HLP file hold different kinds of data, so there is no direct way to turn one into the other.

A full step-by-step guide for this conversion is on the way; the information above is drawn straight from our database.

About these formats

.HDX AutoCAD Help Index File (Delphi MultiHelp Index)

An HDX file is a binary index used by the old Windows Help (WinHelp) system. It appeared in AutoCAD (as ACAD.HDX) and in Borland/Embarcadero Delphi. There is no way to open it on Windows 10…

Open .HDX details →
.HLP Windows Help File (WinHelp)

A HLP file is a compiled Windows Help (WinHelp) file used by programs from the Windows 3.0 era through Windows XP. Windows 10 and 11 no longer include the WinHelp engine, so double-clicking…

Open .HLP details →