One time look for skyboxes from Black Mesa for Xash3d or original half life. Aaand. Does not seeing hires one. Only one in 256, even when HL1 can load 512x ones. So i make for myself ripped ones in 1024x from Black mesa. Look really nice. Don't know if i need upload on gamebanana. Anyone need it ? UPD. Uploaded on gamebanana. When it accepted you can able to download it - gamebanana.com/mods/418251
(Edited)
Upload it please
Just seonds before seeing you comment i've done it :)