On start-up, DrScheme reads configuration information from two files: a normal preferences file and a low-level setup file. The names of these files contain ``MrEd'' because they are part of a preferences system shared by DrScheme and other programs that execute in MrEd.
The name and location of the preferences file depends on the platform and user:
Windows NT: When DrScheme is launched under Windows NT and HOMEDRIVE and HOMEPATH are not set, NT automatically sets the variables to indicate the root directory of the main disk. Therefore, when HOMEDRIVE and HOMEPATH are not set in NT, the preferences file mred.pre is saved in the root directory.
The low-level setup file configures font settings that are needed early in the MrEd boot process. (The information in the setup file is duplicated in the normal preferences file, which is loaded later.) The name and location of the low-level setup file depends on the platform and user: