FMIM files are used by the Xbox 360 "System Music Player" to store music ripped from a CD. They are stereo WMA 9.1 files, with one pass CBR (constant bitrate) at 192kbps/44.1kHz.
FMIM
Header
| Offset | Length | Type | Information |
|---|---|---|---|
| 0x0 | 0x4 | ascii string | magic "FMIM" / 0x464D494D |
| 0x4 | 0x8 | bytes | magic (?) unknown purpose but always 0x100010001 |
| 0xC | 0x200 | unicode string | Track Title |
| 0x20C | 0x200 | unicode string | Album Name |
| 0x40C | 0x200 | unicode string | Artist #1 |
| 0x60C | 0x200 | unicode string | Artist #2 (reason for duplicate unknown, locale?) |
| 0x80C | 0x200 | unicode string | Genre #1 |
| 0xA0C | 0x200 | unicode string | Genre #2 (reason for duplicate unknown, locale?) |
| 0xC0C | 0x4 | unsigned int | Track Length (milliseconds, to nearest second) |
| 0xC10 | 0x4 | unsigned int | Track Number on Album (starts from 0x1) |
| 0xC14 | 0xF4 | bytes | Unknown, sometimes contains readable text |
| 0xD08 | ... (rest of the file) | bytes | WMA 9.1 file containing audio as described above |