Boardview for the Microsoft Surface Pro 5, the Calgary platform, in .bvr format with 1796 in the name. BVR files open in viewers such as FlexBV or the matching boardview tools, showing part placement, nets and pads on the very compact tablet logic board. Technicians use it to locate test points, find shorted capacitors and identify chips without removing shields blindly. Make sure the board revision on your unit matches this layout before relying on it.
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 @skclappybios. Enginerys does not host this file.
How to open a .bvr file
Text boardview from the BoardView R family of tools, seen for Lenovo, MSI and Clevo boards.
OpenBoardViewFlexBVBoardViewer