In this case, someone sends a file with a ".pif" or ".scr" extension and a file name that may excite crypto enthusiast to download and open it. The file usually contains a malicious code which on an attempt to open the file will execute it and what comes out of it afterwards is it could steal your login details, private keys etc and before you realise it, all your cryptos are gone.
I personally don't know much about those file types, but yeah. Never download random files online especially from shady sites/groups/people. If needed, download the file on a temporary virtual machine, so your personal OS in general wouldn't be affected.