HDA-HyperData-File
HDAT-Objective-Analysis-Package-Data-File
HDB-ACT-history-file
HDB-ACT-History-File-Best-Software-CRM-Division
HDB-HansaWorld-Database-File
HDB-Nero-hard-disk-backup-file
HDC-Autodesk-hydrograph-curve-data-file
HDC-HD-Tach-benchmark-file
HDD-data-disk-image
HDD-HelloDOC-medical-software-file
HDD-Parallels-Desktop-for-Mac-Hard-Disk-Drive-Image-Parallels-Inc
HDD-Parallels-Hard-Disk-Drive-File
HDF-Amiga-Hardfile-Image
HDF-Help-file-Help-development-kit
HDF-Hierarchical-Data-Format-file
HDF-National-Center-for-Supercomputing-Applications-NCSA-Geospatial-Hierarchical-Data
HDF-Procomm-Plus-Alternate-Download-file-listing
HDI-AutoCAD-Heidi-Device-Interface-Autodesk-Inc
HDI-HelloDOC-Medical-Software-File-IMAGINE-ditions
HDI-HotDocs-Auto-Install-File
HDK-MAXI-Disk-Disk-Image-Herne-Data-Systems-Ltd
HDL-Alternate-download-listing-ProComm-Plus
HDM-Handheld-Markup-Language-File
HDML-Handheld-Device-Markup-Language
HDML-Handheld-Device-Markup-Language-File
HDMOV-Apple-QuickTime-HD-Movie
HDMOV-QuickTime-HD-Movie-File
HDMP-heap-dumpfile
HDMP-Windows-Heap-Dump
HDMP-Windows-Heap-Dump-File
HDP-HDL-Designer-Project-File-Mentor-Graphics-Corp
HDP-HD-Photo-File
HDP-JPEG-XR-AKA-HD-Photo-Windows-Media-Photo-Header
HDP-Magix-Musstu-file
HDP-Movie-Edit-Pro-Audio-Information-File
HDR-Database-header-Pc-File
HDR-Datafile-Egret
HDR-Message-header-text-1st-Reader
HDR-Message-header-text-ProComm-Plus
HDRU-Apollo-HDRU
HDRU-Apollo-HRDU-image-format
HDS-Hierarchical-Data-System
HDS-Parallels-file
HDS-XMap-Hierarchical-Dataset-Delorme
HDT2-Hard-Disk-Toolkit
HDV-Disk-image-file
HDV-Formula-1-car-race-2001-Season01-Vehicles-Arrows-file
HDW-Vector-graphics-Harvard-Draw
HDX-Help-index-AutoCAD
HDX-Help-index-Zortech-C
TechTarget file types