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When opening specific PMI file in DiscWrite, you have error an error message
File FilePath/FileName.pmi not found.
But the file is there, as you were able to select in the file explorer. 

The file path might not be accepted if there are special characters in the file path. 

Copy the pmi file at the root of one of your drive (for example C:/)
Open the Image file from the new location in DiscWrite.