Download the free, open-source player from the official VideoLAN Project. VLC can read broken index lines and natively decodes almost all WMV variations from 2011 without needing external codec packs.
Why this works: This command extracts the raw video and audio streams from the broken WMV container and places them into a healthy, modern MP4 container with a freshly generated index. 3. Dedicated WMV Repair Utilities
This guide outlines exactly why these legacy WMV multimedia files fail to play properly on modern systems and how to fix them using free, reliable software tools. Understanding the WMV Playback Problem