Esx

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Format of Morrowind's ESM Plug-In File

Basic Overall Format:

The ESM/ESP/ESS files are composed entirely of Records with this format.

Record

   4 bytes: char Name[4]
       4-byte record name string (not null-terminated)
   4 bytes: long Size
       Size of the record not including the 16 bytes of header data.
   4 bytes: long Header1
       Unknown value, usually 0 (deleted/ignored flag?).
   4 bytes: long Flags
       Record flags.
            0x00002000 = Blocked
            0x00000400 = Persistant
   ? bytes: SubRecords[]
       All records are composed of a variable number of sub-records. There
       is no sub-record count, just use the record Size value to determine
       when to stop reading a record.

Sub-Record

The sub-record is the tail of the record and it contains data specific to the record type.

   4 bytes: char Name[4]
       4-byte sub-record name string (not null-terminated)
   4 bytes: long Size
       Size of the sub-record not including the 8 bytes of header data.
   ? bytes: Sub-Record data.
       Format depends on the sub-record type.