Metropolis Software PAK

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Choose archive extension:

PAK

• Format Type : Archive
  
• Endian Order : Little Endian
  
• Signature : None
  

Format Specifications

// ARCHIVE HEADER

uint32 {4}   - Version (1)

uint32 {4}   - Number Of Files

// FILE DATA

// for each file

uint32 {4}   - File Uncompressed Size

uint32 {4}   - File Compressed Size

byte {X}     - File Data (compressed with GZIP)

uint32 {4}   - Unknown (26)

// DIRECTORY

// for each file

uint32 {4}   - Entry Offset

uint32 {4}   - Entry Size

// FILENAME ARRAY

// for each file

uint32 {4}   - Filename Length (including null)

char {X}     - Filename

byte {1}     - null Filename Terminator

// ARCHIVE FOOTER

uint32 {4}   - Encrypted offset to start of the DIRECTORY

Notes and Comments

Offset to DIRECTORY must be decrypted before use. Substruct from it:

• 0 - for demo
• 0x4857 - for retail/en
• 0x4858 - for retail/ru

It's easy to detect right value to substruct - first file offset in DIRECTORY always 8.

Other notes:

• This file format use GZIP compression.
• This file format occurs in games made by Metropolis Software.
• Some filenames are stored in polish language, e.g. "pieklo_fabryka_wnetrze.scene".

Games

List of games using this file format:

• Archangel (PC) (*.PAK)
• Gorky Zero: Beyond Honor

QuickBMS script

• Archangel_PAK_script.bms

Supported Programs

• Archangel Unpacker by Nikita (arcrepak.exe) / mirror1