OpenPool opens a Pool using a slice of MPQ file paths.

File is compressed using combination of compression methods.

File is a deletion marker, indicating that the file no longer exists.

The file is encrypted.

Set if file exists, reset when the file was deleted.

The decryption key for the file is altered according to the position of the file in the archive.

The file contains incremental patch for an existing file in base MPQ.

File is compressed using PKWARE Data compression library.

File has checksums for each sector (explained in the File Data section).

Instead of being divided to BlockFlags = 0x1000-bytes blocks, the file is stored as single unit.

IMA ADPCM compression (mono).

IMA ADPCM compression (stereo).

BZIP2 compression (added in Warcraft III).

Huffmann compression (used on WAVE files only).

PKWARE DCL compression.

Sparse compression (added in Starcraft 2).

ZLIB compression.

The size of an Adler-32 checksum in bytes.

Pool pre-loads multiple MPQ archive headers, allowing fast, concurrent access of archive files.