2.5.1 IBM LAN Server 1.2 and 1.3 . Running Windows with LAN Server 1.3 with CSD 5015 or later requires the files LANMAN.DRV, LANMAN.HLP, WINPOPUP.EXE, WINPOPUP.HLP, NETAPI.DLL, and PMSPL.DLL. These files should be located in your LAN Server directory. If your version of LAN Server does not provide these files, Windows Setup will copy them to your Windows SYSTEM directory. . LAN Server versions below 2.0 do not allow you to use the IBM OS/2 LAN Server aliasing scheme from inside Windows applications. . LAN Server versions below 2.0 do not allow you to log on through Windows Control Panel. Doing so may cause your machine to lock up. Always log on at an MS-DOS prompt, either before starting Windows or while Windows is running. . Windows includes updated versions of the NETAPI.DLL and PMSPL.DLL files shipped with LAN Server. These files are installed during Setup for versions 1.3 with CSD 5015 or higher. .