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You Don’t Have the Right Program
There are specific computer programs that are compatible with HDR files, and you may not have one installed on your computer. The most common programs are Unknown Apple II File, Egret Data File, and Procomm Plus Message Header. Try installing one or more of these programs and see if you can open the file. You can download these programs from either the developers’ websites, the Microsoft Store / Apple App Store, or popular download portals.
You’re Not Sure of the File Type
Knowing the file type can help you open HDR files. Different file extensions can be associated with different types of files. Raster Image Files usually use the HDR extension. You might have a program installed on your computer that is designed to open this type of file. A good first step is trying to open the file in that program.
If you don’t know what type of file the HDR file is, finding this information is simple. Please follow the instructions below depending on the type of operating system you are using.
On a Windows Computer:
- Right-click the file icon.
- Select “Properties” from the drop-down menu.
- Find the file type listed under “Type of File”.
On a Mac:
- Right-click on the file icon.
- Select “More Info” from the drop-down menu.
- Look for the file type listed under “Kind”.
You Need Help From the Developer
If no programs will open the HDR file, you can ask software developers for help. They know their software better than anyone, and they might be able to explain why you can’t open the file. See the chart below to find the developers for the most common programs used to open HDR files.
| Software | Developer |
|---|---|
| Unknown Apple II File | found on Golden Orchard Apple II CD Rom |
| Egret Data File | PC Software Company |
| Procomm Plus Message Header | Microsoft Programmer |
| PC-File+ Database Header | Windows Programmer |
| Radiance HDR Graphics Data | Windows Programmer |
| Photomatix HDR Image | HDRsoft |
| Photoshop | Adobe Systems Incorporated |
| InstallShield Setup Header | Acresso Software Inc. |
| MicroSim PCBoard Hole-Drill Schedule Report | Microsoft Developer |
| ArcInfo Binary ) | Environmental Systems Research Institute Inc. (ESRI |
| Apollo HDRU | Windows Software |
| ArcView Header File | ESRI |
You Need a Universal File Viewer
A universal file viewer, like File Magic (Download), is a tool that you can use to open a file when no other program will work. They can open many different file types, depending on the format. However, some files are incompatible with universal file viewers and will only open in binary file format. If none of the other options listed work, try a universal file viewer to open your HDR file.
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1File types that are unsupported can be opened in binary format.
