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Windows

This information applies to user mode programs running on all desktop and server versions of Windows.

Run-Time Error Messages

  1. If the COVERR environment variable is set, errors are written to the file named.
  2. If COVERR is not set, GUI programs write errors to the file %USERPROFILE%\BullseyeCoverageError.txt. If the USERPROFILE environment variable is not set, errors are written to %TMP%\BullseyeCoverageError.txt.
  3. If COVERR is not set, console programs write errors to the standard error stream.

Environment Variables

If BullseyeCoverage cannot find an environment variable in the process environment, it searches the files listed below.

  1. %USERPROFILE%\BullseyeCoverageEnv.txt
  2. %TMP%\BullseyeCoverageEnv.txt
  3. C:\BullseyeCoverageEnv.txt
  4. %DriverData%\BullseyeCoverage\env.txt or %SystemDrive%\BullseyeCoverage\env.txt
    This file is located and processed the same way for user mode as for Windows Kernel Mode. Filenames in this file are relative to %DriverData%\BullseyeCoverage.

The file format is shown below. 

name1=value1
name2=value2
…

Updated: 12 Aug 2025