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I have a bunch of random two-letters folders on my G: drive. When I remove them, nothing bad happens but they are created after some time. Their names are hexadecimal ([0-9a-f]{2}).

There are binary "*.file" files inside them, each with a name that reminds me of a md5 hash.

An example:

i@r590 /cygdrive/g
$ ls -R ??
...
...
2f:
2feb090616ca2b7badfaeda59e4576a64a5fd726.file

31:
310cadeca062ac893fecc0842b6a8e41974fef29.file
315b3310992cd2428b0e7537a29c7a0da32ad9c8.file
319c31e39bf2ede8fde6a9105705104d4dd6b6e8.file
...
...

I tried:

$ file ff480955a23f938607eee5787f3f73ae2c692a1c.file
ff480955a23f938607eee5787f3f73ae2c692a1c.file: data

And also:

$ strings (file)

But nothing meaningful comes up.

What process might have created them? Or, if you don't know, how to monitor this in Windows?

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These files are created by Spotify to hold its local music cache.

As these files were located in the root of one of my drives (untidy!) I simply created a folder called "Spotify Cache" and changed the location of the cache (which can be set in Spotify → Settings → Advanced) to point to this new folder.

Spotify will then prompt you to restart the program and, when complete, it will have moved the cache files to the new location.

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I don't know what is creating them, however I can help you find out what is.

If you run Process Monitor you can set the filter to show whenever any file ending in the .file extension is created/accessed.

enter image description here

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