Fix NS_E_WMP_CS_JPGPOSITIONIMAGE (0XC00D100E) JPG Error

Quick answer

Convert the JPG file to PNG or BMP using Paint or any image editor. JPG is not supported for positionImage in WMP skins. Re-apply the skin after conversion.

Why this happens

This error pops up when you're trying to use a JPG file as a positionImage inside a Windows Media Player skin file (usually a .wmz or .skin). The skin's XML references a JPG like positionImage = "myimage.jpg". Windows Media Player simply doesn't support JPEG compression for that specific skin element. I've seen this trip up people who download custom skins from random forums or who try to slap their own logo onto a skin without checking the format. Had a client last month who spent an hour rebuilding his whole playlist because the seek bar image was a JPG — took me 30 seconds to convert it.

Fix steps

1. Locate the skin file — usually in C:\Program Files\Windows Media Player\Skins or wherever you downloaded it. If it's a .wmz file, rename the extension to .zip, extract it, and find the JPG image that's used as positionImage.
2. Open the JPG in Paint (Windows built-in) or IrfanView, GIMP, or any image editor. Paint is fine for this — no need to install anything fancy.
3. Save as PNG or BMP — File → Save As → choose PNG or BMP. PNG is smaller and keeps transparency if needed. BMP works but bloats file size.
4. Update the skin XML — open the .skin or .xml file inside the extracted folder with Notepad. Find the line referencing positionImage and change the filename from .jpg to .png (or .bmp).
5. Re-package the skin — zip all files back into a .zip, rename to .wmz, and double-click to install.

Alternative fixes

If you don't want to mess with zipping, just delete the positionImage reference entirely from the XML file. The skin will use the default image for that element — might look a bit off, but it won't crash WMP. Or use a different skin altogether — tons of WMP skins on DeviantArt use PNGs already.

Prevention tip

When creating or editing WMP skins, stick to PNG or BMP for positionImage, mappingImage, and disabledImage. JPG works for backgroundImage and buttonImage in some cases, but avoid it for anything that moves or maps coordinates. Microsoft never added JPG support for those elements, and they're not going to now — WMP is basically in maintenance mode.