This dialog appears when you attempt to open or render a scene with bitmaps or photometric files (IES, CIBSE, LTLI) whose path is no longer current. This can happen if the bitmaps have been moved or deleted, or if the scene has been placed on a system with a different drive mapping than the system on which it was created.

List of bitmaps or photometric files—Lists the bitmaps or photometric files that cannot be located, along with their path names.
Continue—Opens or renders the file anyway, without loading the missing bitmaps or photometric files.
If you continue rendering the scene, the bitmaps do not appear, or the lights assigned missing photometric files will render using the default isotropic distribution.
Browse—Displays a Configure Bitmap/Photometrics Paths dialog, to let you add the missing files' paths to the search sequence. This dialog has the same controls as the Bitmaps/Photometrics panel of the Configure Paths dialog.
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