Thumbs extension is associated with Thumbs.db windows image archive. You can open thumbs files with Windows Thumbnail software.

Windows system puts a file named thumbs.db in the folders which have images. The file includes little versions of all images. In this case, Windows aims to save time while displaying little images.  

You may want to cancel thumbs.db files, it may occupy a place in your system and may disturb you. In this case you should follow these steps:

First you should open any folder and:

Folder options-

tabs from the upper menu. Then pick the thumbnail caching option. 

* You can freely delete the "thumbs.DB" file. There is no risk.

What to use thumbs

Windows Thumbnail

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