Move the downloaded opengl32.dll into the same folder where hl.exe is located. Launch the Game: Start Counter-Strike 1.6.
While CS 1.6 is an older title, using a modified opengl32.dll carries significant risks: cs 16 opengl32dll wallhack f1 work
Often only works with older builds of CS 1.6 (typically v4554 or below) and may crash modern Steam versions. Move the downloaded opengl32