I absolutely DESPISE .SFK files. I work with lots of different client files in various folders and sorting through them with .SFKs mixed in like weeds in a garden is annoying at best. I made a batch file (“roundup.bat”) that goes through all folders and deletes them, but I still have to deal with them between deletions. The time it takes to rebuild the waveform displays is minimal. SFK files are a holdover from the days of Sonic Foundry on “486” computers aren’t they? I’d much rather wait a few extra seconds every time I open a file than to have half the files in my folders be essentially useless clutter. The cache idea is excellent. Sprinkling .SFK files all over the place is just sloppy programming.