BMG files
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Stores strings used in games for localization. Can be found in a Wii Fit and Wii Fit Plus disc.
The file structure is composed by a header and sections. The essential sections are INF and DAT. The MID section can also be found on Wii Fit Plus disc, but the meaning is unknown.
The file is not completely known.
The endianess is Big Endian.
BMG header
The header is 32 bytes long. Here's a description of it:
| Offset | Size | Description |
|---|---|---|
| 0x0000 | 4 | "MESG" (0x4D455347) |
| 0x0004 | 4 | "bmg1" (0x626D6731) |
| 0x0008 | 4 | File size |
| 0x000C | 4 | Number of sections? Version? (Wii Fit: 0x00000002, Wii Fit Plus: 0x00000003) |
| 0x0010 | 4 | Unknown (0x02000000) |
| 0x0014 | 12 | Padding? |
INF section
It comes just after the BMG header. It contains information (like pointers) about the messages.
INF header
| Offset | Size | Description |
|---|---|---|
| 0x0000 | 4 | "INF1" (0x494E4631) |
| 0x0004 | 4 | Size of this section (bytes from section beginning) |
| 0x0008 | 2 | Number of messages |
| 0x000A | 2 | Size of each INF data (bytes) |
| 0x000C | 4 | Padding? |
INF data
For each message, there is a INF data about it. At Wii Fit, there is just the message offset. At Wii Fit Plus, there is two another fields.
| Offset | Size | Description |
|---|---|---|
| 0x0000 | 4 | Offset to the message (after DAT section header) |
| 0x0004 | 4 | Some flags? (0x00640000 seems to be "normal messages", 0x006E0000 for "menu choices" ...) |
| 0x0008 | 4 | ? |
DAT section
It contains just header and the messages themselves.
| Offset | Size | Description |
|---|---|---|
| 0x0000 | 4 | "DAT1" (0x44415431) |
| 0x0004 | 4 | Section size (bytes from section beginning) |
| 0x0008 | - | Messages |
MID section
This section is probably message IDs. There appears to be one for each message and these can presumably be used by the wii to identify each message.
| Offset | Size | Description |
|---|---|---|
| 0x0000 | 4 | "MID1" (0x4D494431) |
| 0x0004 | 4 | Section size (bytes from section beginning) |
| 0x0008 | 2 | Number of entries |
| 0x000A | 2 | ? |
| 0x000C | 4 | Padding? |
| 0x0010 | 4 | Entry #1 |
| 0x0014 | 4 | Entry #2 |
| ... | 4 | Entry #... |