wiki upload error

[eluser]cleansugar[/eluser]
1. I want to upload CI 1.7.2 Korean language pack 1.1 file.

It returns error:

The following errors were encountered

* The file you are attempting to upload has invalid content for its MIME type.

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2. It have no upload button in this bbs edit.
So I can't upload this file: http://www.codeigniter-kr.org/source/download/471/1210