| File Extension: | HDM |
| File Type Description: | Handheld Device Markup Language (HDML) File |
| File Type Developer: | Openwave Systems Ltd |
| Primary Associated Software: | Microsoft Notepad |
| Primary Software Developer: | Microsoft Corporation |
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Release of the Notepad++ software program prompted the development of the Handheld Device Markup Language (HDML) File file type by Don Ho. Commonly, Handheld Device Markup Language (HDML) File files are found on user computers from United States, and on PCs running the Windows 10 operating system. Most of these users are running the Google Chrome web browser.
 | NoteTab by Fookes Software |
 | Notepad++ by Don Ho |
 | TextPad by Helios Software Solutions |
 | Microsoft Notepad by Microsoft Corporation |
 | Apple Pages by Apple |
| Windows 10 | Windows 11 | Windows 6 | Windows 8.1 |
 | Windows |
 | Mac |
 | Linux |
 | iOS |
| Extension | File Type Developer | File Category | File Type Description |
|---|---|---|---|
| .HDML | Openwave Systems Ltd | Web Files | Handheld Device Markup Language (HDML) File |
| .CSH | Adobe Systems Incorporated | Uncommon Files | Photoshop Custom Shapes File |
| .EFS | ESRI | GIS Files | ESRI Spatial Binary File |
| .OLE | Microsoft Corporation | Data Files | Microsoft Object Linking And Embedding Data |
| .VHDL | Microsoft Corporation | Developer Files | VHDL Source File |
| .DSP | Open Source | Audio Files | Dynamic Studio Professional Module |
| .OHP | Microsoft Corporation | Data Files | MS-DOS 7 File |
| .ITRACE | Microsoft Corporation | Data Files | Microsoft Visual Studio Data File |
| .OMP | MatchWare | Page Layout Files | OpenMind Windows Document |
| .XIX | Microsoft Corporation | Data Files | IIS NNTP Subject Lists |
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