You're watching a stream or opening a saved playlist, and boom — NS_E_CURL_INVALIDCHAR (0XC00D1325) kills it. The media player (usually Windows Media Player or a WMP-based app like Windows 10's Groove) tells you the URL has characters that aren't allowed. This pops up most often when you paste a link that includes spaces, curly quotes, or ampersands right from a chat or webpage. I've seen it happen with YouTube playlist links and with local files that have odd characters in the file path.
Why this happens
URLs are picky. They only allow a specific set of characters — letters, numbers, and a few symbols like -, _, and .. Anything else, like a space or &, must be "percent-encoded" (e.g., space becomes %20). When you copy a link from somewhere that hasn't encoded it properly, or you manually type a URL with a stray quote, the player can't parse it and throws 0XC00D1325.
The real fix is to make sure the URL is properly encoded. But there are a few ways to get there, depending on where the URL came from.
Fix it in 3 steps
Step 1: Clean up the URL (most common fix)
- Copy the full URL from your address bar or source.
- Paste it into Notepad (or any text editor).
- Look for spaces, quotes (‘, “, ”), or backslashes (\). Replace them with the correct encoding:
- Space →
%20(or+for query strings) - Curly quote → straight quote or remove it
- Backslash → forward slash
/ - Ampersand
&→&if it's part of an HTML page, but in a raw URL it's usually fine
- Space →
- Paste the cleaned URL back into the player.
This fixes the error for 90% of folks. The key is spotting the sneaky characters — spaces are the usual culprit, but I've seen curly quotes from Word documents break things, too.
Step 2: Use an online encoder (if you're not sure)
If you don't want to hand-encode, paste the URL into a URL encoder (like urlencoder.org) and copy the encoded version. That automatically converts spaces, quotes, and everything else to the safe format. Then paste that encoded URL into WMP. This is the lazy-but-correct approach.
Step 3: Switch players (for stubborn cases)
Sometimes the URL is fine, but WMP's ancient parser is too rigid. VLC Media Player handles bad URLs more gracefully. If the error persists after encoding, try opening the same URL in VLC (Media → Open Network Stream). If it works there, the URL was never the problem — WMP was. I've saved myself hours by just switching to VLC.
Still failing? Check these
- File paths: If you're opening a local file, make sure the file path doesn't have special characters. Rename the folder or file to something simple (no &, #, or spaces).
- Playlist files: Open the .wpl or .asx playlist in Notepad and inspect the URLs inside. They might have the same bad characters. Fix them in the file, save, then reopen.
- Proxy or firewall: Rare, but some network setups interfere with URL parsing. Try disabling your proxy temporarily (Settings → Network → Proxy) and retry.
The 0XC00D1325 error is annoying, but it's almost always a simple fix. Clean that URL, encode it properly, or just move to a better player. You'll be back to your stream in minutes.