"Drag and drop" corrupts attachment name

[ChaSer]

See attached picture.
There is new message with one file attached twice (same file).
First was attached trough "Add attachment" button.
Second though "Drag and drop" feature.
"Drag and drop" corrupts attachment name.

Server OS: Ubuntu 10.04 x64 + ZCS 6.0.8 + Patch 3
Client OS: Windows 2003 Server SP2 Russian/ Windows XP Professional SP3 Russian
Browser: Firefox 3.6.12

How to configure drag and drop feature ?

[ChaSer]

Please vote for this bug "international characters in drag-and-drop file names appear incorrectly" on bugzilla:
https://bugzilla.zimbra.com/show_bug.cgi?id=54056