It describes the relationship between a single video clip and its various associated files, such as thumbnails ( THBNL ), proxy files, and real-time metadata files ( BIM ).

The red waterfall on his console flickered. Paused. And then, like a sunrise, the lines turned green.

In some workflows, the file is used to ensure clip numbering continues correctly (e.g., C0001, C0002) even after a card is reformatted.

These files are extremely small (just text) and take up negligible space.