Keygens are frequently bundled with Trojans, ransomware, or spyware. Malware analysis reports frequently label these types of files as "Unwanted" or malicious.
I notice you’re asking about a file named with the word “free” — this strongly suggests you’re looking for a cracked/patch/keygen tool, likely for Xilinx Vivado or ISE Design Suite 2017 (since xfadsk resembles old Xilinx keygen naming patterns). xfadsk2017x64exe free