Fix NS_E_INCOMPLETE_PLAYLIST (0XC00D1242) in Windows Media Player

You hit play, and Windows Media Player gives you the 0XC00D1242 error

It's annoying. You've got a playlist ready to go, and instead of music, you get that message. I've seen this more times than I can count across Windows 7, 10, and 11. The culprit is almost always a missing or broken file reference in the playlist.

The Quick Fix: Rebuild the Playlist in WMP

Don't waste time hunting through registry keys or reinstalling codecs. Here's what actually works:

1. Open Windows Media Player (WMP).
2. Go to the Library tab (if you're in Now Playing mode, press Alt+1 to switch).
3. Find the broken playlist in the left pane under Playlists.
4. Right-click the playlist and select Delete — choose Delete from library only (don't delete the actual files).
5. Now manually drag the music files you want from your Music folder back into the Playlist pane. Save it with a new name.

That's it. 9 times out of 10, this kills the error. The issue is that WMP stores playlist data in a proprietary format inside its library database. When a file gets moved or renamed outside of WMP, the old reference becomes a dead link. By deleting and recreating the playlist, you force WMP to re-index the actual file paths.

If That Doesn't Work: Check the Playlist File Itself

Some people use .wpl or .m3u playlists from third-party tools. These can break if the path syntax is wrong. Open the .wpl or .m3u file in Notepad. Look for lines like this:

#EXTINF:123,Artist - Song Title
C:\Users\YourName\Music\Artist\Song.mp3

If that path doesn't exist on your drive (maybe the drive letter changed, or you moved the folder), fix the path. Save the file, then re-add it to WMP.

Why This Happens: The Short Version

WMP doesn't store copies of your music in its library — it just remembers where the files are. If you move a folder, rename a directory, or plug in an external drive with a different letter, those references become null. The error code 0XC00D1242 is WMP saying "I found the playlist, but some files aren't where you said they'd be." It's not a corruption of the media player itself.

Less Common Variations of This Issue

Network Drive or USB Drive Playlists

If your playlist points to files on a network share or removable USB, the error often appears when the drive isn't connected. Plug it in first, then launch WMP. If the drive letter changes (e.g., E: becomes F:), you'll need to update the paths in the .m3u or .wpl file.

Corrupted WMP Library Database

Rare, but possible. The database file lives at:

%USERPROFILE%\AppData\Local\Microsoft\Media Player

Close WMP completely. Delete everything in that folder (don't worry, WMP re-creates it). Then restart WMP — it'll rebuild the library from scratch. This wipes out your play counts and ratings, so only do this if the quick fix fails.

DRM-Protected Files

Old WMP playlists sometimes included DRM-protected .wma files. If the license expired or the file's rights were revoked, WMP skips it and throws this error. Your only option here is to remove those files from the playlist.

Prevention: Stop This from Coming Back

• Keep your music files in one master folder — like C:\Music\. Don't scatter them across Documents, Desktop, and Downloads.
• Use relative paths in .m3u files if you're creating playlists manually. Instead of C:\Music\Artist\Song.mp3, use ..\Artist\Song.mp3. That way, moving the folder still works.
• Avoid renaming folders after you've added them to WMP. If you must, delete the playlist first, move the files, then recreate the playlist.
• For portable playlists (like on a USB stick), use a tool like MusicBee or VLC to manage them — they handle broken paths better than WMP ever did.

That's the whole thing. Rebuild the playlist, and you're done. If you're still stuck after these steps, you're probably dealing with a corrupted user profile or a system file issue — but that's a different article. For this error, the playlist is always the problem.