Fix 0XC00D14B7 Windows Media Player Unsupported Entry Error

This error pops up when Windows Media Player can't handle a certain file type in a playlist. The fix is straightforward: convert or remove the unsupported entry.

Quick answer for advanced users

Delete or convert the file that WMP can't play. The error code 0XC00D14B7 means the playlist entry points to a format WMP doesn't support — like FLAC, OGG, or a corrupted file. Convert it to WMA or MP3 using something like VLC or ffmpeg.

Why this happens

Windows Media Player is picky. It loves WMA, WMV, ASF, MP3 (sometimes), and MP4 with certain codecs. But throw in a FLAC file, an OGG Vorbis track, or even an old RealAudio file, and it spits out the NS_E_PLAYLIST_UNSUPPORTED_ENTRY error. I've seen this more times than I can count — last month a small law firm had a whole playlist of deposition recordings in FLAC format because their transcription guy insisted on "lossless." Took me five minutes to convert the lot.

The core issue: WMP can't decode the file. It's not a corrupt playlist file itself — it's the entry pointing to something the player can't handle. This also happens if the file is missing from the path, but you'd usually see a different error for that. The number 0XC00D14B7 specifically flags an unsupported format.

Fix steps

Identify the problem file. In Windows Media Player, look at the playlist. The error usually highlights the broken entry. If it doesn't, right-click the playlist and choose "Open file location." That takes you to the actual folder and you can spot files with odd extensions like .flac, .ogg, .ape, or .wv.
Remove it (quick fix). Right-click the entry in WMP and select "Remove from list." The rest of the playlist plays fine. Done. But if you need that file, move to step 3.
Convert the file. Open the file in VLC media player. Go to Media > Convert / Save. Add the file, click Convert / Save, choose a profile (I use Audio – MP3 for most cases), pick an output folder, and hit start. You can also use ffmpeg from command line:
```
ffmpeg -i input.flac -acodec mp3 output.mp3
```
Add the converted file back to the playlist. Drag the new MP3 or WMA file into WMP or use the "Add to" menu. Your playlist now plays without errors.

Alternative fixes if the main one fails

Install a codec pack. If you're dead set on keeping the original format, try the K-Lite Codec Pack (Standard or Full). It adds support for more formats to WMP. But honestly, codec packs can bloat your system and sometimes break other stuff — I avoid them unless absolutely necessary.
Use a different media player. Just ditch WMP for this specific file. VLC plays everything out of the box — FLAC, OGG, even weird old formats like APE. Set it as your default for audio files. Right-click the file, choose "Open with" > VLC, and check "Always use this app." WMP won't throw the error because it never touches the file.
Check for file corruption. Occasionally the file is partially corrupted and WMP can't parse the header. Try playing it in VLC — if it fails there too, the file is toast. Re-download or re-rip it.

Prevention tip

Stick to WMA or MP3 for any playlist you plan to use with Windows Media Player. I tell clients: if you're ripping CDs, use WMA 192 kbps — it's native to WMP, sounds fine, and never throws format errors. For downloaded music, check the extension before adding to a playlist. Avoid FLAC, OGG, APE, WV, and anything that says "lossless" unless you're using VLC. One extra step now saves you the headache later.

Pro tip: If you share playlists (like .wpl or .asx files) with colleagues, make sure everyone uses the same player. WMP playlists opened in iTunes or VLC often break because the file paths or formats don't match. Keep it simple — plain MP3s in a folder, no fancy playlists.