Database url

Hello,

Can anybody tell me if there is a rule regarding urls character cases for database accessed through domino web engine? I have seen some servers that were ignoring it (so folder ‘data’ and ‘Data’ meant the same) but recently I discovered a server running on windows 2003 that was blocking access to readDesign url command because part of the URL (that was generated by my agent) contained upper case characters. The wrong part of url was obtained through FilePath property of NotesDatabase. I can fix this by adding lcase, but it would be nice knowing why this is wrong and why @WebDbName returns working file path (in lower case).