Because "loader" is a generic name used by many different programs—including malicious ones—you should verify the source before opening it:
The file is likely a duplicate download of a software tool, often associated with game modding or utility software. The "(3)" in the filename simply indicates that your computer already has three other files named "loader" in that same folder. loader (3).zip
Use a tool like VirusTotal to upload the ZIP file and check it against multiple antivirus engines. Because "loader" is a generic name used by
Genuine mod loaders usually contain .dll files or simple executables; if you see unexpected file types (like .scr or .vbs ), do not run them. loader (3).zip
Do you remember this file from, or what program you were trying to update?