I have tested loading files into Calibre 1.0 (Windows) and am not having the same experience. As before the file names are truncated to keep within the Windows path length restriction but I get file names in the Calibre library folder way longer than 31 characters; just taking one random example the file name length was 49 characters when truncated.
Along the lines Adoby suggested already, I do have my libraries in their own folder straight off the root of the drive though which will result in shorter paths, and hence less truncation, than if one uses the default Calibre library location. It is so long since I have used the default, but if recall correctly the default is somewhere in the C:\User\username\etc\etc path?? which is long; much longer than it appears in Explorer if one is just looking at the Windows Libraries path directly under the Desktop.
Maybe the algorithm that shares the path length restriction truncation between the author folder name length and the book file name length has changed but it does not, for me anyway, result in file lengths being restricted to 31 characters. In fact I have noticed nothing yet that grabs my attention at all, compared to the truncations of earlier versions.
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