filenames with multibyte characters problem

[thanatos]

The uploader cannot handle filenames with multibyte characters on some hosts, such as FileSonic, FilePost and Multiupload.
Now I only found this issue on the two hosts, so the subject is focused on the 3 sites.
This issue doesn't appear on XFileSharing Pro based sites, such as FileServe, UploadStation, and FileJungle.
Besides, MegaUpload and MediaFire don't have this trouble, too.

In order to provide a safe and quick example, I just create a simple txt file to upload.

1) Multiupload

1a) This file is uploaded by my browser (Firefox); OS is Win2008 English version (language of OS doesn't affect the result)
http://www.multiupload.com/IJ023CNEJU
The filename is correct.


1b) This file is uploaded by z_o_o_m's File & Image Uploader (without proxy)
http://www.multiupload.com/TCQGUSO0X7
You can see the filename becomes "??????????????.txt".


2) FileSonic

2a) It's uploaded by a browser
http://www.filesonic.com/file/GjSYMbn
It works properly.

2b) This one is uploaded by z_o_o_m's File & Image Uploader (without proxy)
http://www.filesonic.tw/file/m4ZPs3A
The problem is the same as Multiupload.

Please at least fix the issue of FileSonic, FilePost and Multiupload.
Thanks.