Android application package named elfilm, version 0.4.6, about 32 MB in size. The name does not say what the app does or whether it relates to repair work, so its purpose cannot be confirmed from the listing alone. APK files are installed on Android phones or tablets, usually after allowing installation from unknown sources. Scan any side-loaded package with antivirus software before installing, and check the permissions it requests. Keep it away from devices that hold sensitive data until you know what the software does.
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 @tv_software. Enginerys does not host this file.