Finger rig problem

I started port some mine models from SFM to Gmod since I got some skills with ragdoll creation.
But when I renamed fingers bones from “LHandFinger1” (for example) into “ValveBiped.Bip01_L_Finger0”, Model Viewer said, that bone have “LHandFinger1”, but Blender and Notepad++ - “ValveBiped.Bip01_L_Finger0”.
What’s a problem and how I can fix it?