ZIP archive tied to the Philips 20PFL3439 LCD television, judging by the model code in its name; the name gives no hint of what is inside. At 2.29 MB it most likely holds a firmware dump of the main board flash, possibly with notes or a service file. Open it with any archive tool and check the contents before use. If it is a flash image, confirm the chip type and capacity on your board match, and read and save the original chip contents with a programmer before writing anything to 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 @hashmielecom. Enginerys does not host this file.
How to open a .zip file
Compressed archive that every operating system opens without extra software.