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CHANS is the system used by the Wii's system menu to display "dynamic" banners. It seems to be some form of bytecode. This page shall describe said bytecode and the header for CHANS files. You may find a CHANS file in the News Channel as content index 5.

Here is what is known of the structure for the header:

typedef struct {
        // All offsets are from 0x20
        u32     head;
        u32     version;
        u32     file_size;
        u8      unk[0x14];
        u8      unk2[0x10];
        u32     unk3;
        u32     unk4;
        u32     unk5;
        u32     unk6;
        // Table 1 is made up of 8 byte chunks
        u32     table1_count;
        u32     table1_offset;
        // Table 2 is the method name list
        u32     table2_count;
        u32     table2_offset;
        // Table 3 is a string literal table
        // Each string is in utf-16 and ends with 0x00240020 (.$. )
        u32     table3_count;
        u32     table3_offset;
        // Possibly unused table?
        u32     unk7;
        u32     unk8;
        u32     unknown_count_mybe;
        u32     unknown_offset;
} bacs_header;

typedef struct {
        u8      length;
        u8      padding;
        u16     offset;
} table2_entry;

This data is in no way 100% complete, so far it works but table 1 and 2, but in future this could break with further files tested.

TODO: A lot! Keep adding data, people!