I disagree with minmay about disabling file preview.
1) Maybe is a level gimmicky and you can see some secrets on file preview.
2) Maybe it is passworded and author won't let people see how level looks like.
3) I downloaded files what had disabled file preview to see how is that level good/bad.
But on other hand, I agree on disabling "Delete" button because authors are deleting their levels because of low ratings and reviews what they don't like.
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