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Microsoft did something to file explorer (Windows shell) a while ago (I think it started with the Fall Creators Update) that causes an incredibly annoying delay when opening a folder containing FLAC files for the first time. After the folder has been opened once, the files populate instantly from then on.
After some investigation I guess Microsoft updated a shell extension to read metadata (id3 tags etc) from media files that causes the delay with flac. Also there is something called: Microsoft Media Feature Pack. I checked and I have this feature automagically installed, I think it came with the Fall Creators Update but not sure of that)
My question is: Has anyone else noticed this, or have any idea on how to fix it? I already disabled Cortana, this was not the problem. The problem appears only with flac files.