Using LR1.0 I have become aware that I will have to rename all of my files. My existing file name structure was yyyy_nnnn showing the year and file number respectively. However, the find function in LR (Windows) has proved unable to find any files that use the underscore. It works fine when _ is replaced with - but it is annoying to say the least to have to make these changes.
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It has to do with the nature of _ in SQLite. Same on Mac.