BMG (File Format)
BMG is a file format used to hold text in SMG1. This was replaced by the MSBT file format in SMG2. Unlike the messages in SMG2, SMG1 uses a single, region specific BMG file (Region/message.arc/message.bmg) to hold ALL text.
Format Specifications
Below you'll find helpful tables on how the file is structured.
THIS IS SPECIFIC TO SMG1/3D All Stars. Other games that use BMG might be different!
All Char[] types are in ASCII encoding.
Header
| Offset | Type | Description |
|---|---|---|
| 0x0 | Char[4] | File magic. "MESG" for SMG1, "GSEM" for 3D All Stars. |
| 0x4 | Char[4] | File magic. "bmg1" for SMG1. "1gmb" for 3D All Stars. |
| 0x8 | UInt32 | FLW1 Section Offset. |
| 0x0C | UInt32 | Section Number. |
| 0x10 | UInt8 | Unknown. Believed to be a definition of encoding in some games. |
| 0x11 | UInt8[15] | Padding. |
Section Base
| Offset | Type | Description |
|---|---|---|
| 0x0 | Char[4] | Magic. Relates to the Section Type it is. |
| 0x4 | UInt32 | Section Size. |
Section Types
This is where things get a little weird. Depending on the Magic from the Section Base, it can be one of the following types below.
INF1 Section
| Offset | Type | Description |
|---|---|---|
| 0x0 | UInt16 | Section Number. |
| 0x2 | UInt16 | Section Size. |
| 0x4 | UInt8[4] | Padding. |
DAT1
| Offset | Type | Description |
|---|---|---|
| 0x0 | UInt8[] | Section Data, determined by Section Size. Contains wchar_t strings. |
FLW1
| Offset | Type | Description |
|---|---|---|
| 0x0 | UInt16 | Node Number. |
| 0x2 | UInt16 | Brach Node Number. |
| 0x4 | UInt8[4] | Padding. |
FLI1
Not used/supported in SMG1/3D All Stars.
Tools
The following tools can handle SMG1's BMG (some may have 3D All Stars support, but most don't.)
- Wiimms SZS Tools (wbmgt) (Can convert a BMG to a TXT file. High chance of crashing if you edit with this.)
- Tomato (Can convert a BMG + the TBL file to a XML file and vise versa. Has 3D All Stars Support)