Download that file and copy/paste it to your diablo 2 folder, makesure to back up your original d2gfxdll, then run your normal diablo2 or game.exe file to start playing.
Stop messing with loader, d2loader is crap
that file is a edited version of blizzard dll to allow more than one copy of diablo running and it removes the cd check.
you can trust the file for 2 reasons, 1 cause i say so!
2) notice the ip address. it's on the dedicated server.