# PFS file format
The file format called "PFS" in this document is an archive format used in EverQuest.
Extensions: .s3d, .eqg, .pfs, .pak
Every PFS has a "directory" entry, that contains the filenames
A .s3d file describes a zone and embeds a .wld file
A .eqg usually has only one file with a "EQGM" header
offset size notes
0 u32 ofs_entries offset to file entries
4 u32 magic 0x20534650 ("PFS ")
ofs_entries + 0 u32 number of entries
+ 4 u32 crc (of compressed data ?) if 0x61580AC9 then it's a directory entry
+ 8 u32 ofs_file offset of compressed data
+ c u32 expanded_size size of expanded data
ofs_file + 0 u32 len_comp compressed length
+ 4 u32 expanded length
+ 8 len_comp compressed data block (usually 0x2000 bytes)
multiple compressed blocks (extract until buffer len is expanded_size)
ofs_dir + 0 u32 entry length
+ 4 u32 filename_len
+ 8 filename_len 0-padded file name
ssratemple.s3d - the level map is embedded as ssratemple.wld
ssratemple_chr.s3d - zone specific models ?
ssratemple_obj.s3d - zone objects ?
# Credits
https://github.com/alimalkhalifa/VisualEQ/blob/master/src/server/loaders/s3d.js