[Gutenberg]

I use the following template in Calibre->Preferences->Saving Books To Disc:

{author_sort}/{title}/{authors} - {series}{series_index:0>2s| - | - }{title}

It works great except for the Folder name -- if the author's FN ends with a period (.), the period is replaced by an underscore (_). So, for example, I end up with Folders like these:

Box, C.J_/Blue Heaven/C. J. Box - 2009 Edgars Mystery Awards 01 - Blue Heaven.epub
Parker, Robert B_/Sixkill/Robert B. Parker - Spenser 40 - Sixkill.epub

The {author_sort} variable works fine if I use it elsewhere in the template, and the period is not replaced.

{author_sort}/{title}/{author_sort} - {series}{series_index:0>2s| - | - }{title}

Parker, Robert B_/Sixkill/Parker, Robert B. - Spenser 40 - Sixkill.epub

Is there any way to fix this? I'd prefer to have my folders sorted "LN, FN" so replacing {author_sort} with {authors} is not an option. And I'd rather not have to strip the periods from all author names with abbreviations.

Also, I work on a Mac, so the length limitations on Windows filenames should not be the problem.