The adventure originally was distributed as five separate ASCII (.TXT) files. Files 1 - 4 contain standard text. File 5 actually contains postscript executable code that, when rendered, produces a PDF containing two pages of maps. When these files were combined into a single file the map portion was "lost".
The text bears the internal date of 1988, which probably is the date of creation. The most-commonly-encountered ZIP archive of all the pieces bears the meta-data date of 1996.