This is the specifications for the archive file which is handled by the Game Extractor plugin Archive_DAT_PSPFSV1.

Endian Order:	Little Endian
Compression:	None
Encryption:	None

This format is used by the following Games:

Disgaea 2

*.dat

This is the format specification information:

// ARCHIVE HEADER 8 - Header (PSPFS_V1) 8 - Number of Files // DETAILS DIRECTORY // for each file (52 bytes per entry) 40 - Filename (null terminated, filled with nulls) 4 - Unknown 4 - File Length 4 - File Offset 0-511 - null Padding to a multiple of 512 bytes // FILE DATA // for each file X - File Data 0-511 - null Padding to a multiple of 512 bytes

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.