.fseventsd

File system events directory, macOS's per-folder log files recording changes for the FSEvents API

Not a file (scheme/atom)

Format facts

MIME type: application/x-fseventsd
Apple UTI: custom
Stock Quick Look: no stock preview
Planned approach (census): not-a-file
Icon hint: generic-icon
Prevalence: rare

Renderer note (from the census)

proprietary FSEvents log format

Gotchas: macOS file system log