GPD

GPD (Gamer Profile Data) files are used by the Xbox 360 to store information inside a profile. They are based on the XDBF format. Profiles are composed of many of these files, each named under their respective executable's title id (e.g. 4D5307E6.gpd for Halo 3). The dashboard GPD (FFFE07D1.gpd) contains information and sync information about the titles.

Entry Table

An ID of 0x100000000 indicates that the entry is a Sync List, an ID of 0x200000000 means its a Sync Data entry.

The Settings, Achievement and Title namespaces each have their own Sync List and Sync Data entries.

An ID of 0x8000 usually indicates that entry is information to do with the title (image/name).

Entry Namespaces

Value	Description
1	Achievement
2	Image
3	Setting
4	Title
5	String
6	Achievement Security (? created by GFWL for offline unlocked achievements)

Entry Structures

Achievement Entries

Offset	Length	Type	Information
0x0	0x4	unsigned int	Magic (0x1C)
0x4	0x4	unsigned int	Achievement ID
0x8	0x4	unsigned int	Image ID
0xC	0x4	signed int	Gamerscore
0x10	0x4	unsigned int	Flags (see below)
0x14	0x8	signed long	Unlock Time
0x18	null terminated	unicode string	Name
0x18 + Name length	null terminated	unicode string	Locked Description
0x18 + Name length + Locked Description length	null terminated	unicode string	Unlocked Description

Image Entries

Image entries are composed of a PNG image.

String Entries

String entries are simply a unicode string, to the length specified by the entry.