There is a limitations on opening compressed files in the assets folder. This is because uncompressed files can be directly memory mapped into the processes virtual address space, therefore avoiding needing the same amount of memory again for decompression. This post dicusses some techniques in dealing with compressed files.
You can trick aapt into not compressing the file by using a extention that is not compressed (e.g. Mp3) or you can manually add them to the apk without compression instead of getting aapt to do the work.
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