There is only one file type that uses the .MI4 extension:
Audio Player Firmware File

- Developer NVIDIA
-
Popularity
- Category System Files
- Format Binary
Firmware file used by various audio players that have the PortalPlayer chipset, including SanDisk, Philips, Samsung, and older iPod players; contains low-level software functions and themes that are used to run the audio player.
MI4 files are used to upgrade or change the themes of an audio player.
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Updated: August 14, 2010