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The new weapons are indeed Hi-Def, but they're also from all over the place, have no credits (BIG no-no), and the arms don't match at all. There's also no replacements for the new weapons introduced in the mod, so the chaingun still looks awful.
There's also NO DLL FIX, so the mod is still incompatible with modern versions of Half-Life.
Finally, the English translation still sucks. Minor, I know, but worth mentioning all the same.
This is actually a pretty good mod. Unfortunately it won't play properly on the Steam version of Half-Life.
Due to the custom code being incompatible with newer versions of Half-Life, you'll need to run the mod on a much older version of Half-Life. I've managed to get it working on version 188.8.131.52, so if you want to try this mod, try it on that.
There was also an English patch that translated the subtitles, but again, it relied on the updated code that doesn't work properly in newer versions of Half-Life, so you probably didn't even know there WERE subtitles.
I wasn't sure what this was, so I took the plunge and tried it. It just replaces a few of the backgrounds in the main menu. Nothing major, but it's nice if you want something a little different.
A quick Google search reveals the mod's site is located here:
The mod's not actually finished yet: it's about 80% done.