[ryerman]

I see %errorlevel% 0.

code:
Microsoft Windows [Version 10.0.19043.1288]

(c) Microsoft Corporation. All rights reserved.

C:\Program Files (x86)\Winamp>winamp /add "W:\[Various Artists]\Billboard Top 100\2001\01 Alicia Keys - Fallin'.mp3"

C:\Program Files (x86)\Winamp>echo %errorlevel%

0

C:\Program Files (x86)\Winamp>