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This error occurs when clicking the Make Default button on the Customize dialog box:
Assertion: "Project has filename" failed at line 1581 of file"../appl/project.c"
Your system doesn't have the $HOME environment variable defined.
Create a $HOME environment variable.
For help with setting a system environment variable, see: How To: Edit an environment variable.
Note: If ArcView cannot find a $HOME variable on your system, it will use the $TEMP variable instead.