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I noticed that every single folder inside my pictures folder has a new hidden folder named ".Thumbnails". It has thumbnails of its parent folder. Thumbnails are actually quite large ranging from 160 pixels to 512 pixels in one dimension.

I noticed this with unusual activity in my backup process. All folders seems to be created on July 18 between 9:30 pm to 11 pm. I recently two apps iTunes on July 24 and Crashplan (another backup software) on July 19.

I do not think these are windows default folders. I want to find out which application is creating these folders and why it started suddenly. And lastly, how can I get rid of all of them easily?

Update: I find out that I used SyncToy 2.1 around the same time to copy my user account to a network drive.

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Do you have GIMP installed on your computer? –  amiregelz Jul 27 '12 at 10:14
I have GIMP installed. Not the latest version and I have it for more than a year. –  Szere Dyeri Jul 27 '12 at 16:31
find -iname .thumbnails -ctime 7 -exec rm -rf {} \; I used this cygwin command to delete all .thumbnails folders created in last 7 days. My user account folder was full of them. –  Szere Dyeri Jul 27 '12 at 16:34
Open your Program Files folder and sort it by date, and see what you installed on July 18 around 9pm. Do a search on your entire drive for other files that were created at that time to see if you can figure out what program you ran that created them. –  Synetech Jul 27 '12 at 16:38
It is possible that GIMP is responsible for creating the .thumbnails folders. I know for a fact that a ".thumbnails" folder is created by GIMP, however, AFAIK it should be only one folder and it should be in your GIMP directory. I would try doing what Synetech has suggested, and also checking whether you have used GIMP for any purpose on July 18. –  amiregelz Jul 27 '12 at 21:48
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