id Software's September 1996 Quake Development CD supplied source data and utilities and explicitly supported modifying data in place or in an add-on directory.

Format Web Page

"id Software’s September 1996 Quake Development CD supplied source data and utilities and explicitly supported modifying data in place or in an add-on directory."

Primary id Software documentation shows that Quake's development tooling was built to support deep modification of game data and code.

Source title README.TXT

Source authors John Carmack

Source year 1996

Confidence high

Importance high