About the Alan distribution for Microsoft Windows:

Depending on if you downloaded the ZIP-archive or the Windows
installer you will get a command line version or a Windows GUI
version.

Note: To run the Windows GUI interpreter 'winarun' you will need a
Windows "GLK.DLL". WindowsGLK DLL is included in this distribution but
can also be downloaded from:

http://www.ifarchive.org/if-archive/programming/glk/implementations/WindowsGlk-?.zip