I am having trouble with Galaxy removing the .mgz file extension from Freesurfer files I upload. I understand .gz gets stripped for gzipped files, but the pattern matching algorithm for detecting the extension must be treating the '.' as 'any character' rather than a literal '.' character. I am left with .m files. Anyone else have this problem? The .mgz file is not a compressed format. 
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Bill C. White, MS
Research Associate Programmer