No, I don't know what the files are for, and I think chances are quite good that other people will also not recognize this particular collection of files. They do look safe to delete.
Silverlight is not commonly distributed, as an official installer, as a silverlight.7z file. So it appears this is something custom.
The silverlight.msi is a Microsoft Installer file. You might find that some or all of the 5 other files might be located inside the silverlight.7z file. "install.exe" sounds like a very generic name, so if it is something different than Silverlight, the filename is not a detail that is sufficient enough to identify what the file is. (In Explorer, you may be able to Right Click on the file, choose Properties, and see some information, like the name of an organization that helped to create the file.)