HRESULT 0xC00D119B (NS_E_WMP_PLAYLIST

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Description:

Windows Media Player cannot create the playlist because the name already exists. Type a different playlist name.%0

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NS_E_WMP_DSHOW_UNSUPPORTED_FORMAT	NS_E_WMP_NONMEDIA_FILES

NS_E_WMP_PLAYLIST_EXISTS

Diagnosing NS_E_WMP_PLAYLIST_EXISTS in the Windows Media Player playback path

NS_E_WMP_PLAYLIST_EXISTS (0xC00D119B) is returned when playlist creation collided with an existing library playlist name or identity.

Record what the Player had already completed because later retries often replace the original evidence. The specific rejected condition is playlist creation collided with an existing library playlist name or identity.

Controlled playback comparison

Start from the original call and log 0xC00D119B together with its object and operation phase.
Collect requested name, existing PlaylistCollection entries, case normalization and whether the item is static or auto-generated before changing the machine.
Use this single-variable test: enumerate current playlists, choose a unique name and create a new empty list once.
Repeat on a fresh object if the original predates a configuration, device or resource change.
Validate the expected next operation, not just initial open or object creation.

Actions that obscure the cause

deleting the media files referenced by the existing playlist.

Technical references

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