Why not allow deleting *.cap format files?

in kali linux, I use thunar to delete *.cap files in folder “home/kali/fluxion/attacks/Handshake Snooper/handshakes/” but it doesn’t work because when I click to select the file and mouse right click the menu appears but the “Move to Trash” button is grayed out, I delete files in other folders normally, I want to delete the above file, what should I do ? Anyone who knows please help me

Who is the owner of those files?

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I’m betting root owns them.

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Or maybe the poster still has the file open in wireshark or whatever.