Winsock
To search for winsock on win 3.1 go to Main\File Manager\File\Search\winsock.dll

Netscape 1.22:
location: c:\netscape
size: 26644 bytes

Netscape 2.01 - 3.01
location: c:\netscape
size: 30516 bytes

IE 3.02a
location: c:\iexplore
size: 141824 bytes

Windows 3.1 Walk-through