Windows executable called FixServer, 9.03 MB. The name does not say which tool, device or service it belongs to, so its purpose cannot be confirmed from the file alone. Utilities with such names are often companion server or service programs for repair or unlocking software and only work with their matching client. Scan the file with antivirus software before running it, preferably in an isolated environment. Check its properties or digital signature to identify the publisher and version.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @phoneSchematics. Enginerys does not host this file.