PDF document of 972 KB named only TX4150A, catalogued as a schematic, with no brand, device or board details in the name. The part number looks like an integrated circuit or module code, so the file may be a datasheet or reference design rather than a full board schematic. Open it in any PDF reader to check pin assignments, application circuits and typical values. Confirm the marking on the component you are replacing matches TX4150A before using its specifications.
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 @datasheets1. Enginerys does not host this file.
How to open a .pdf file
The standard format for schematics, block diagrams, power-sequence charts and service manuals.