Make a back-up copy of your environment (.env) file. To find the full name and path of your environment (.env) file, right-click a project name inside the Project Manager, and select Settings.
Open the .env file in a text editor such as WordPad.
Look for a line in the environment file that begins with "WD_LIB."
Edit this line to reflect the path of your default library.
Enter a specific path:
WD_LIB,n:/elec/syms/,AutoCAD Electrical symbols
Use %ACAD_SUP_LAST% or %ACAD_SUP_FIRST%to point to the last (or first) path defined in your AutoCAD Options Files Support file path: