Please include the following information:
1) Your XYplorer Version (e.g., v28.00.0801)
2) Your Windows Version (e.g., Win 11)
3) Your Screen Scaling Percentage (e.g., 125%).
We strongly recommend adding your Windows Version and Screen Scaling Percentage to the Location field in your Profile or to your Signature. That way, you only have to type them once, and we won't have to search for that vital information.
When attaching an Image, please use the Attachment tab at the bottom of your post and click "Add files".
The extension-device mapping is read from the following registry key (XP):
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\MCI Extensions
The device-DLL mapping is read from the following registry key (XP):
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\MCI32
The value "MpegVideoOld" comes from your registry: apparently some installation has renamed what has been "MpegVideo" before.
HTH, can't do any thing without more information,
Donald