Olá Daniel,
tudo bem? O comportamento é esperado e documentado:
URL path length restrictions (SharePoint Server 2010) - http://technet.microsoft.com/en-us/library/ff919564(v=office.14).aspx
KB894630 - http://support.microsoft.com/kb/894630/en
Você poderá tentar a criar algum tipo de workaround, porém creio é melhor a educar o(s) usuário(s). Verifique também este excelente artigo - http://blogs.msdn.com/b/selvagan/archive/2009/12/06/unable-to-edit-files-uploaded-to-document-library-where-url-length-is-more-than-260-characters.aspx
.
Abraços
David
SharePoint Support Engineer
Blog: http://spinternals.blogspot.com.br/
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