Fix NS_E_WMX_INVALID_FORMAT_OVER_NESTING (0XC00D1076)

What's Actually Happening Here

The error code 0XC00D1076 — NS_E_WMX_INVALID_FORMAT_OVER_NESTING — means Windows Media Player's XML parser hit a depth limit when reading a .wpl, .asx, or .xml playlist file. Microsoft's parser stops at around 256 nested elements. If your file has tags inside tags inside tags beyond that, the player gives up and throws this error.

You'll see this most often after exporting a playlist from iTunes or a third-party tool that builds deeply nested XML. Or if you manually edited a playlist and didn't close tags properly — that can also cause the parser to read deeper than intended.

The fix is straightforward: reduce nesting depth. There's no registry tweak or driver update that helps. It's purely a file format issue.

Simplest Fix (30 seconds): Open and Flatten the File

Press Win + E to open File Explorer.
Navigate to the folder containing the playlist that triggers the error. Most are in %USERPROFILE%\Music\Playlists for Windows Media Player playlists, but could be anywhere you saved them.
Right-click the .wpl or .asx file, choose Open with → Notepad (or any plain text editor).
Look for deeply nested <seq>, <media>, or <entry> tags. The nesting usually looks like:
```
<seq>
  <media>
    <media>
      <media>
        ...
```
That's bad. Flatten it so each <media> is a direct child of <seq>, not nested inside another <media>.
Save the file, then try opening it in Windows Media Player again.

Why this works: The parser expects a flat list under <seq>. Each <media> should be a sibling, not a parent-child chain. Collapsing the nesting drops the depth below the limit.

Moderate Fix (5 minutes): Rebuild the Playlist Manually

If the simple fix doesn't work — or the file is too mangled to fix by hand — rebuild it from scratch. This is the most reliable method.

Open Windows Media Player.
Drag the original music files (the ones that were in the broken playlist) into a new playlist in the Player's library pane.
Right-click the new playlist, choose Save as, and pick a new name.
Delete the old corrupted playlist file from the Playlists folder.

Why this works: Windows Media Player writes new playlists with a flat structure. It never nests <media> tags more than one level deep. You're essentially replacing the broken XML with a clean copy.

If you can't get the old songs into the Player — maybe they're on a network drive or external drive — you can build the playlist using a text editor:

Create a new .wpl file.

Use this skeleton:

<?wpl version="1.0"?>
<smil>
  <head>
    <title>My Fixed Playlist</title>
  </head>
  <body>
    <seq>
      <media src="C:\Music\song1.mp3"/>
      <media src="C:\Music\song2.mp3"/>
    </seq>
  </body>
</smil>

Make sure each <media> is directly inside <seq>, not inside another <media>.

Save with a .wpl extension, then double-click to open in Windows Media Player.

Advanced Fix (15+ minutes): Strip CDATA or Escaped Content

Sometimes the nesting isn't from the playlist structure itself — it's from CDATA sections or escaped HTML inside a <title> or <abstract> tag. If you see something like this:

<title><![CDATA[<b>Rock Classics</b>]]></title>

The parser counts the CDATA content as part of the nesting tree, even though it's just data. The fix is to strip the CDATA wrapper and keep only the text:

Open the playlist in Notepad++ or VS Code (something that highlights XML).
Search for <![CDATA[ and ]]>.
Replace the entire CDATA block with just the inner text. For the example above, change it to:
```
<title>Rock Classics</title>
```
Also look for escaped characters like < (which means <). If you see <b> inside a tag, replace it with plain text. The parser treats escaped HTML as literal characters and still counts the nesting.
Save the file and test.

Why this works: Windows Media Player's XML parser (based on older MSXML) handles CDATA as a child node, increasing the depth count. Stripping it removes that phantom layer. Same for escaped markup — it's still parsed as content inside the parent tag, adding to the depth.

If none of these fix it, the file might be corrupt beyond repair. In that case, use a tool like MP3Tag or MediaMonkey to re-export the playlist from your music library. Those tools write clean XML.