XNA Game Studio 4.0 XNB

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XNB

• Format Type : Archive
  
• Endian Order : Little Endian
  
• Signature : XNB
  

Format Specifications

// XNB file format
// little endian

//header
3 bytes (char) - signature // "XNB"
1 byte (char) - target platform // "w" - Microsoft Windows
                                // "m" - Windows Phone 7
                                // "x" - XBOX 360
                                // "d" - Windows??
                                // "S" - Nintendo Switch
                                // "v" - PlayStation Vita
1 byte (uint8) - XNB format version  // 5 = XNA Game Studio 4.0
1 byte (uint8) - flags   // bit 0x01 - content is for HiDef profile (otherwise Reach)
                         // bit 0x80 - asset data is compressed
4 bytes (uint32) - total file size
if compressed_flag == True:
    4 bytes (uint32) - uncompressed file size


// Note: If the file is compressed (flag bit 0x80 is set), data from this point on 
// is packed using the Xbox XMemCompress API


// type manifest
7BitEncodedInt - type reader count
type_reader_count *
{
   7BitEncodedInt - string length
   x bytes (char) - type reader name  // e.g. "Microsoft.Xna.Framework.Content..."
   4 bytes (int32) - reader version number  // e.g. 0
}


// data
7BitEncodedInt - shared resource count
primary asset data
{
   7BitEncodedInt - resource type   // e.g. 1 - Microsoft.Xna.Framework.Graphics.Texture2D
   x bytes - resource data
}

shared_resource_count *
{
   x bytes - shared resource data
}

Notes and Comments

• Some files may be compressed with LZ4 or with Xbox XMemCompress compression.

Games

List of games using this file format:

• Bleed (PC) (*.XNB)
• Bleed 2 (PC) (*.XNB)
• Bloody Trapland (PC) (*.XNB)
• Bury me, my Love (PC) (*.XNB)
• Celeste (PC) (*.XNB)
• Plants vs zombies (for Windows Phone 7)
• TowerFall Ascension (PC) (*.XNB)
• Many more...

QuickBMS Script

• xnb.bms

Compatible Programs

• XnaConvert
• XNBExporter
• XNBEditor
• SimpleXNBDemapper
• XNB Kit
• xnbdec
• xnbcli

See Also

• XNB file format + parser