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Hi Tomáš , my name is Jose. I'm an Independent Advisor and a Windows user like you. I'll be glad to help you today.
You can identify to which applications those pictures belongs. To this, please right click over a picture and select open in File Explorer. This will bring you to the folder where that picture are saved.
Be careful. Those pictures can belong to a program or game. Check this before delete a picture.
Please let me know if you need any further assistance.