File uploading in IE with umlauts in filename

I have this file upload and it works in Firefox fine, but when I upload file n IE and filename has umlauts, then filename is corrupted. After file is uploaded I echo filename and filename is corrupted like in my exampl开发者_运维技巧e.

Example:

ä.png is converted to ä.png

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It's just the encoding which don't match, try

echo utf8_decode($filename);