NS_E_FILE_OPEN_FAILED (0XC00D001D): Fix File Open Failure in Windows

File or Folder Permissions Are Blocking Access (Most Common)

Nine times out of ten, this error pops up because Windows or a media app like Windows Media Player or Windows Media Center can't read the file due to permission restrictions. You'll see it when you try to open a video, music file, or playlist that's stored on a secondary drive, a network share, or a folder that's been moved or restored from backup.

Here's how to fix it:

1. Right-click the file that gives you the NS_E_FILE_OPEN_FAILED error. Select Properties from the menu.
2. Go to the Security tab. You'll see a list of groups and users under "Group or user names."
3. Click Edit to change permissions. A new window opens.
4. In the list, select Everyone. If you don't see "Everyone," click Add, type Everyone in the box, then click OK.
5. Under "Permissions for Everyone," check the box for Full control (or at least Read).
6. Click Apply and then OK. Close the Properties window.
7. Try opening the file again. If it works, you're done. If the error persists, try the same steps on the folder that contains the file—right-click the folder, go to Properties > Security, and add Full control for Everyone.

What to expect: After you apply the new permissions, the file should open without the error. If you get an "Access Denied" message when changing permissions, you need to take ownership first. Right-click the file, go to Properties > Security > Advanced, click the Owner tab, then Edit, and change the owner to your user account. Apply, then try the permissions step again.

This fix works on Windows 10, Windows 11, Windows 8.1, and Windows 7. I've seen it fix the error for MP4, WMV, WMA, and MP3 files that were saved to external drives or copied from another computer.

Another Program Has Locked the File

When the permissions are fine but the error still shows up, there's a good chance another program has the file open and locked. Windows Media Player or Media Center can't access a file that's already in use by something else. This happens when you're trying to play a file that's currently being written to by a video editor, a download manager, or even a backup tool.

Here's how to check and unlock it:

1. Press Ctrl + Shift + Esc to open Task Manager.
2. Click More details at the bottom if you see the simple view.
3. Go to the Performance tab, then click Open Resource Monitor at the bottom.
4. In Resource Monitor, go to the CPU tab. Expand the Associated Handles section.
5. In the search box under "Associated Handles," type the name of your file (for example, video.mp4).
6. Resource Monitor shows you which process has a handle on that file. The process name appears in the list—like vlc.exe, chrome.exe, or explorer.exe.
7. If you see a program you recognize, close it normally. If it's a system process or you're not sure, right-click the process in Resource Monitor and choose End Process. Be careful—don't end critical Windows processes.

What to expect: After you close the locking program, the file should open right away. If you can't find the lock, restart your computer. That clears all file handles, and the error will be gone when you boot back up.

I've fixed this for users who had a video file stuck open in a video editor like DaVinci Resolve or Adobe Premiere. The editor crashed but left a file handle behind. A restart or ending the process in Resource Monitor is the cleanest fix.

The File Itself Is Corrupt or Partially Downloaded

If permissions and file locks aren't the issue, the file might be corrupt. This is common with incomplete downloads, files copied from a damaged disc, or media files that were converted by a buggy tool. The error can also pop up if the file's header is missing or corrupted.

Here's what to try:

1. Re-download the file if it came from the internet. Use a download manager or your browser's built-in downloader, but make sure the download finishes completely. Check the file size—if it's a lot smaller than expected, it's incomplete.
2. Try a different media player. VLC Media Player is famous for playing files that Windows Media Player can't. Download VLC from videolan.org, install it, and open the file with VLC. If VLC plays it fine, the file is probably fine—the error is specific to Windows Media Player or Media Center.
3. Repair the file if it's truly corrupt. Use a tool like ffmpeg (free, command-line) to re-encode the file. Run this command in a command prompt:

   ffmpeg -i inputfile.mp4 -c copy outputfile.mp4

   Replace inputfile.mp4 with your filename and outputfile.mp4 with a new name. This copies the streams without re-encoding, often fixing simple corruption.
4. If ffmpeg fails or you don't want to use the command line, try a repair tool like HandBrake (free, GUI-based). Load the file, choose the same format, and encode it to a new file.

What to expect: After re-downloading or repairing the file, it should open without the error. If the file is still broken after all that, it's probably gone for good. Delete it and get a fresh copy from your source.

I've seen this happen with MP4 files downloaded from email attachments or cloud shares that got truncated. Always check file size before spending time on other fixes.

Quick-Reference Summary

That's it. Start with permissions, then check for locks, then handle corruption. One of these will get your file playing again. No need to reinstall Windows or mess with registry edits—those won't help here.