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Stands for Assumption Software.

Software which performs actions that it assumes is OK with the user. An example of AssumptionWare would be a program that installs into a directory with no option for the user to specify a different one. Another example would be a program that writes log files with no
option to disable.
Windows can be considered AssumptionWare, since it automatically installs Internet Explorer without option.

by The Sniffing Accountant March 14, 2008