Only unblock files that you trust. This mechanism exists to prevent users from accidentally running malicious payloads downloaded via drive-by downloads or email attachments.
Download handle64.exe and place it in your C:\Windows\System32 folder or a path of your choice. powershell unlock file
If this returns a stream record, the file is blocked. If it throws an error saying the stream doesn't exist, the file is already unlocked. Only unblock files that you trust
The output will look like: notepad.exe pid: 8764 type: File C:\path\to\your\file.pdf taking ownership can help.
If a file is locked because a process has an open handle to it:
: Sometimes, taking ownership can help.