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Error: unusual characters in the names of files stored in my 40GB personaldata space
Now that the UTF8/Unicode command is supported, files previously encoded in ISO-8859-15 may no longer be displayed. If this occurs, you must explicitly specify "ISO-8859-15" as the encoding in your FTP client or synchronisation software.
In other words, if you experience problems with accents or encoding issues with the names of files previously uploaded to the server (and encoded in Latin1), you must configure your FTP client to not use UTF8 (Unicode) in order to be able to view these names correctly.
In Filezilla, go to Site Manager -> Character Set
Link to this FAQ: