BNCL (Binary Nitro Cell Layout) are [jnlib layout files|Jnlib Layout File Format] that define the locations of cells on the screen. It has a file signature of {{"JNCL"}}.

Following the file header is a series of layout elements. This is structured as follows:

||Offset||Type||Meaning
| 0x00   | u16 | X coordinate/origin
| 0x02   | u16 | Y coordinate/origin
| 0x04   | u32 | Cell index.

The position of cells are calculated by using the bounding rectangle information in the [cell bank|NCER].