Weird .download files keep emerging in Downloads folder It's a while some random files with .download extension are emerging inside my download folder and I can't find what are these and what creates them, even I can't open them. 

These files are like this:


And when I get their info it's like this:



There is no running download at the moment.
Apparently, Telegram Desktop generates these files during "failed" searches when using the @gif command. The ones that Telegram generates are easily identified by being named with a series of 18 digits (e.g 532576936841446647.download), usually similar to one another, and always at zero-bytes length.

You can replicate the issue by trying some @gif searches after removing all files and seeing them being generated again.

They're safe to be removed; watch out not to remove the Safari ones, though, unless you'd like to restart your ongoing downloads.