The "8sk" suffix often appears in community-modified versions of emulators, sometimes associated with specific "skins," "sketches," or developer handles. Since I cannot open the file directly, here is the general context of what a "Nester" zip file typically contains:
.ini or .cfg files that store user settings, button mappings, and video preferences. Nester8sk_Old.zip
readme.txt or changes.txt files explaining the specific "Old" version's features or bug fixes. A file like Nester
A file like Nester.exe used to run NES games on a PC. Are you trying to with this version of Nester, or
Supporting files required for the emulator to interface with your hardware.
If you are looking for a specific text output from the zip, such as a or a license agreement , you will need to extract the archive on your device and open the .txt or .doc files located inside.
Are you trying to with this version of Nester, or