If a file is listed in a project, but it is doesn't exist anymore on the filesystem, CVI doesn't mark it in any way in the project tree.
If the file is an .uir, this brings to a strange behavior with "Find UI object" (see here).
I think that files non-existent on the filesystem should be marked mark in some way (color, special icon, ...) in the project tree.
The check can be done when the user opens and closes the project.
Vix
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In claris non fit interpretatio
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Using LV from 7
Using LW/CVI from 6.0