A. USER.DMP is created by Dr. Watson when a program crashes, and is there to help you fix the problem. It can be examined using \support\debug\i386\dumpexam.exe or using windbg -z user.dmp. You can delete this file without any worries. The syntax for dumpexam.exe is

dumpexam -y <symbol file location> <dumpfile name and location>, e.g.
dumpexan -y d:\winnt\symbols d:\winnt\memory.dmp

The output from dumpexam will be placed at %SystemRoot%\MEMORY.TXT.

To stop this file being created execute DRWTSN32.EXE and unselect the option "Create Crash Dump File".