What a DMP file is and why you might need to open one
A DMP file is a memory dump — a snapshot of everything your computer's memory was holding at a specific moment, usually when a program crashed or stopped working. Windows creates these files automatically when something goes wrong, and they land in a folder on your hard drive with a name like "MEMORY.DMP" or a file starting with the date and time of the crash.
You might need to open one because technical support asked you to send it, or because you're trying to figure out why a program keeps crashing. The file itself is not readable as plain text — if you open it in Notepad, you'll see garbage characters. You need the right tool to translate it into something a human can understand.
The good news: you don't need to be a programmer. Windows includes a built-in viewer, and the process takes about five minutes once you know where to look.
Key Takeaways
- DMP files are memory snapshots created when Windows crashes, and they sit in your system folder or on your desktop depending on your Windows version.
- You cannot read a DMP file in Notepad or Word — you need the Windows Debugger, which is free and comes with Windows or can be downloaded separately.
- The easiest path for most people is to locate the file, right-click it, and use the built-in preview, or read the Debugger if that doesn't work.
- If you're sending the file to support, compress it first because DMP files are usually very large.
Finding where your DMP file is stored
Windows puts DMP files in different places depending on your version and what caused the crash. The most common location is a folder called "Minidump" buried inside your Windows system folder. To get there, open File Explorer, click the address bar at the top, and paste this path: C:\Windows\Minidump — then press Enter.
If that folder is empty or doesn't exist, check your Desktop or your Downloads folder, because some crashes save the file there instead. You can also search for "*.dmp" using File Explorer's search box in the top right — the asterisk tells it to find any file ending in .dmp, no matter what the name is.
Once you find the file, note its size. DMP files are often hundreds of megabytes or larger. If you need to email it to someone, you'll want to compress it first by right-clicking, selecting "Send to," and choosing "Compressed (zipped) folder."
Opening a DMP file with the Windows Debugger
The Windows Debugger is the tool designed to read DMP files. It's free, and it comes built into Windows 10 and Windows 11, though you may need to read it separately if you're on an older version.
To check if you have it, open the Start menu and search for "WinDbg" — if it appears, click it to open the Debugger. If it doesn't appear, go to the Microsoft Store, search for "Windows App SDK," and install it, which will give you the Debugger as well. Alternatively, you can read the Debugger directly from Microsoft's website by searching "Windows Debugger read" — look for the link from microsoft.com.
Once the Debugger is open, click "File" in the menu bar, then "Open Crash Dump." Navigate to your DMP file, select it, and click "Open." The Debugger will load the file and display information about what was running when the crash happened.
Understanding what you see in the Debugger
When the Debugger opens your DMP file, the window will fill with technical information. The most useful part for a non-technical person is usually near the top, where you'll see lines like "Bugcheck code" or "Exception code" — these are error codes that describe what went wrong. You can search for these codes online to find out what they mean.
Below that, you'll see a list of programs and processes that were running. If a particular program appears at the top of the list or is highlighted, it's often the one that caused the crash. Look for program names you recognize — something like "chrome.exe" or "firefox.exe" — rather than system files with names like "ntoskrnl.exe."
If you're sending this information to technical support, take a screenshot of the top section or copy the text and paste it into an email. You don't need to understand it yourself — support will know what to look for.
A simpler option: using the Event Viewer
If opening the Debugger feels like too much, Windows has another tool called Event Viewer that shows crash information in plainer language. Open the Start menu, search for "Event Viewer," and click it. On the left side, click "Windows Logs," then "System." Look for entries marked "Error" or "Critical" with a red X icon — these are your crashes.
Click on one of these entries, and the bottom pane will show details about what happened. You'll see the program name, the error code, and sometimes a description of the problem. This won't show you as much detail as the Debugger, but it's often enough to tell you which program is crashing and search for a fix online.
Event Viewer doesn't require you to read anything, and it's faster than the Debugger if you just need a quick answer about what crashed.
What to do if you can't open the DMP file
If the Debugger won't open your file, the file may be corrupted or incomplete. Try these steps: first, make sure you're using the most recent version of the Debugger by uninstalling it and downloading it again from Microsoft. Second, check that the file actually ends in ".dmp" — sometimes Windows saves crash files with other extensions like ".log" or ".txt."
If the file is very old (more than a few years), it may have been created by a Windows version the current Debugger doesn't support. In that case, Event Viewer is your better option, or you can contact the software maker for that program and ask them to help you interpret the crash.
If you're trying to open a DMP file that someone else sent you, make sure it actually came from them — never open a DMP file from an unknown source, because it could contain malware.
Frequently Asked Questions
Can I open a DMP file on a Mac or Linux computer?
Not with the Windows Debugger — that tool only works on Windows. If you have a Mac or Linux machine, you would need to transfer the file to a Windows computer first, or use a specialized tool designed for that operating system. Most people just email the file to Windows-using support staff.
Is it safe to delete DMP files to free up space?
Yes, it's safe to delete them. DMP files are just records of past crashes — deleting them won't affect your computer's operation. If you're running low on disk space, you can delete all the DMP files in your Minidump folder without worry. Windows will create new ones if another crash happens.
Why is my DMP file so large?
DMP files are large because they contain a copy of everything in your computer's memory at the moment of the crash — potentially gigabytes of data. If you need to email it, compress it first, which usually shrinks it by 50 to 80 percent. If it's still too large for email, ask the person requesting it whether they need the full file or just a summary from Event Viewer.
Do I need to send the DMP file to Microsoft?
Only if Microsoft support specifically asks for it. Most of the time, technical support for a program just wants to know the error code or the program name, which you can get from Event Viewer without sending the whole file. Always ask before sending a DMP file, because they're large and contain information about what was running on your computer.