This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_VPPPC.

Endian Order:Little Endian
Compression:LZ4 FRAMED
Encryption:None


This format is used by the following Games:
Agents of Mayhem *.vpp_pc
Saints Row: The Third: Remastered *.vpp_pc str2


This is the format specification information:
 
// ARCHIVE HEADER
  8 - Unknown
  8 - Unknown
  4 - Number of Files
  4 - Number of Folders?
  4 - Details Directory Length
  4 - Names Directory Length
  8 - Archive Length
  8 - Unknown
  8 - File Data Length
  8 - Unknown
  8 - File Data Offset
  48 - Description (or null)
  
// DETAILS DIRECTORY
  // for each file (48 bytes per entry)
    8 - Filename Offset (relative to the start of the names directory)
    8 - Directory Name Offset (relative to the start of the names directory)
    8 - File Data Offset (relative to the start of the File Data)
    8 - Decompressed File Length
    8 - Compressed File Length (or -1 if not compressed)
    2 - Compression Flag (0=uncompressed, 1=compressed)
    2 - Unknown (1)
    4 - null
    
// NAMES DIRECTORY
  // for each Filename and Directory Name
    X - File/Directory Name
    1 - null Name Terminator
    
  X - null Padding to a multiple of 16? bytes
    
// FILE DATA
  // for each file
    X - File Data


Game Extractor is able to read files of this type, as well as files from thousands of other games. To give it a try, download Game Extractor (Basic Version) for free, and see what it can do.

For further information on this format, refer to the source code on our GitHub repository.