RAR archive of 12.8 KB titled TDC SZUSB, with no brand, revision or document type in the name. It appears related to the TDC-SZUSB module, a small USB accessory board, and at this size most likely holds a boardview or a similar layout file. Extract it and check the contents and version before use. A layout of this kind helps locate parts, follow the USB data and power lines, and check for shorts. Compare the PCB markings with the file before trusting component positions.
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 @boardview. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.