HDT

hdt icon

Adobe Photoshop HDR toning preset

File type: Settings, options, themes or skins file

Files with hdt extension are associated with the Adobe Photoshop program. A hdt file contains stores HDR settings.

Found 4 different file type records with the same hdt filename suffix.

What is hdt file?

File type category:
Settings, options, themes or skins file

Date updated: October 14, 2024

File extension hdt is related to the Adobe Photoshop, a digital picture and photo editing software for Microsoft Windows and macOS (OS X) systems.

A typical .hdt file stores settings for enhance HDR (High Dynamic Range) photo. Used by Photoshop CS5 and newer.

How to open hdt file?

Use Adobe Photoshop to work with hdt files.

Suggested software to open hdt file:

Associated software actions with the hdt file

Software applications that can open hdt files:

Microsoft Windows

Apple macOS / Mac OS X

Software apps that create hdt files:

Microsoft Windows

Apple macOS / Mac OS X

Software apps that manage or store settings in hdt files:

Microsoft Windows

Apple macOS / Mac OS X

Software applications that handle other tasks involving hdt files:

Helium Music Manager TagEditor file

File type category:
Various data file

Date updated: October 2, 2026

Helium Music Manager uses the HDT file to store data used by its integrated TagEditor. The file belongs to the application's internal data rather than representing an audio recording or other user media.

Helium Music Manager is designed for Microsoft Windows.

How to open hdt file?

Open the file with Helium Music Manager on Microsoft Windows. The software normally reads its HDT data as needed; opening the file directly may not display useful content.

How to convert hdt file?

The HDT format is used for internal Helium Music Manager TagEditor data and is not normally converted to another media format.

Associated software actions with the hdt file

Software apps that create hdt files:

Microsoft Windows

Software applications that handle other tasks involving hdt files:

Microsoft Windows

HTML document tree

File type category:
Document file

Date updated: November 7, 2024

Record marked as obsolete and not updated for a long time.

The hdt file extension is used for documents, that contain HTML tree from a syntactically correct HTML document.

Most likely some old format without support. No further information could be found.

How to open hdt file?

Use text editor or web browser to open HDT HTML document tree file.

How to convert hdt file?

Probably cannot be converted to anything else.

Suggested software to open hdt file:

Associated software actions with the hdt file

Software applications that can open hdt files:

Microsoft Windows

Microsoft Windows NotePad icon Microsoft Windows NotePad

Apple macOS / Mac OS X

Linux/Unix

Software applications that can edit hdt files:

Microsoft Windows

Microsoft Windows NotePad icon Microsoft Windows NotePad

Apple macOS / Mac OS X

Linux/Unix

Software capable of saving hdt files:

Microsoft Windows

Microsoft Windows NotePad icon Microsoft Windows NotePad

Apple macOS / Mac OS X

Linux/Unix

Proactive Windows Security Explorer hash data

File type category:
Encoded and encrypted file

Date updated: October 12, 2026

Record marked as obsolete and not updated for a long time.

Proactive Windows Security Explorer is Microsoft Windows software used to test password security. Its hdt files store application-specific hash data used by the program.

The format is associated with password-security tools rather than with general document or image applications. SAMInside is also associated with this file type on Microsoft Windows.

The format is obsolete, so new software may not support it. Keep the original file unchanged if it is still needed with compatible software.

How to open hdt file?

On Microsoft Windows, open the hdt file with Proactive Windows Security Explorer or the associated SAMInside software.

A general-purpose text editor or archive utility will not provide a useful way to view this format.

How to convert hdt file?

There is no standard conversion method for the obsolete hdt file format. It contains application-specific hash data rather than content intended for conversion to a standard document format.

If a compatible version of Proactive Windows Security Explorer or SAMInside provides an export function, use that function to save the data in one of its supported formats. Otherwise, retain the original file.

Suggested software to open hdt file:

Proactive Windows Security Explorer icon
Proactive Windows Security Explorer
An older password management program

Associated software actions with the hdt file

Software apps that create hdt files:

Microsoft Windows

no icon available Proactive Windows Security Explorer

Software apps that import hdt files:

Microsoft Windows

Software applications that handle other tasks involving hdt files:

Microsoft Windows

no icon available Proactive Windows Security Explorer

Related file extensions