The search for an "Eyes Wide Shut MKV fixed" file could stem from several factors:

He closed the player, but the captions lingered in his head. He pulled out his phone, thumb hovering over a message to an old friend he hadn’t spoken to in years. The file had been altered; the night had been altered; he had been altered by the small printed phrases of other people’s days. He typed, then deleted, then typed again: “Do you still have my sweater?”

The subject typically refers to specific technical corrections made to digital video files (MKV format) of Stanley Kubrick's final film, Eyes Wide Shut

Ensuring the 5.1 surround sound or the original stereo track aligns perfectly with the visuals.

This is the most reported issue: high-bitrate sections (colorful, noisy scenes) cause stuttering.