What Is an HDMP File?

How to open, edit, and convert HDMP files

HDMP files in a folder

 Tim Fisher

A file with the HDMP file extension is a Windows Heap Dump file used for storing uncompressed error files generated, or "dumped," when a program crashes in Windows.

Compressed dump files are stored in the MDMP (Windows Minidump) format and are used by Windows to send the crash reports to Microsoft.

HDMI is a common search term that has a similar spelling as HDMP but it has nothing to do with this format or any file format. HDMI stands for High-Definition Multimedia Interface.

How to Open an HDMP File

HDMP files that are Windows Heap Dump files can be opened using Microsoft Visual Studio through its File > Open menu. Recent versions of Visual Studio can open HDMP, MDMP, and DMP (Windows Memory Dump) files this way.

If you're using a version of Visual Studio that doesn't seem to let you open an .HDMP file, just rename the file to .DMP and then try again. The program should support that file type. However, if you get an error about "not enough storage," it's likely that the dump file is too large for Visual Studio to load into memory.

Windows Heap Dump files pair with the Windows Debugger tool.

You can safely remove HDMP and MDMP files from your computer if you don't want to investigate the cause for the errors or if they're taking up too much disk space. However, if the problem persists, it's likely that more of these dump files will be created. As with all computer problems, it's always best to resolve them before they get out of hand.

If you find that an application on your PC does try to open the HDMP file but it's the wrong application or if you would rather have another installed program open HDMP files, change the default program in Windows.

How to Convert an HDMP File

We're not aware of any way to convert an HDMP or MDMP file to any other format.

More Information on Dump Files

The Windows Registry location that holds error reporting information is in the HKEY_LOCAL_MACHINE hive, under the \SOFTWARE\Microsoft\Windows\Windows Error Reporting key.

The folder that programs typically hold dump files in may be called dumps or reports, and is typically found in the program's installation directory. However, others might keep these files in a totally different folder, like DellDataVault for Dell programs, for example, or CrashDumps.

If you need help finding an .HDMP, .MDMP, or .DMP file on your computer, one easy way to search for it is with the free tool Everything.

If at any time while a process is running, you'd like to create a DMP file, you can do so through Windows Task Manager. Just right-click the process you want the dump created for, and then choose Create dump file.

Still Can't Open Your File?

Windows dump files might use the HDMP, MDMP, or DMP file extension, and some file formats use a file extension that closely resembles those, making it really easy to confuse one format for another.

For example, HDML is spelled almost the exact same as HDMP but is used for Handheld Device Markup Language files. If your file isn't opening with the HDMP openers from above, check that the file really does end with ".HDMP," because HDML files will not work with the programs listed above.

It's equally as easy to confuse MDMP and MDM files. The latter might be in the HLM Multivariate Data Matrix file format or the Mario Dash Map file format, but again, neither are related to HDMP files.

DMPR files are easy to mix up with DMP files but these are Direct Mail Project files used by Direct Mail.

If you don't have a dump file, be sure to research the real file extension for your file to learn which programs can open or convert it.