View source for PAK (ARC extension)

== Identification ==

PAK format files made by PAK/GSARC v1.0 typically start with bytes <code>0x1a 0x0a</code>, and end with <code>0x1a 0x00</code>.

Files made by PAK v1.5–1.6 typically start with <code>0x1a 0x0a</code>, and end with <code>0xfe 0x00</code>.

Files made by PAK v2.0+ typically start with <code>0x1a 0x0b</code>, and end with <code>0xfe 0x00</code>.

A file that ends with <code>0xfe 0x00</code> could also be identifiable as PAK format if the first byte is <code>0x1a</code> and the second is <code>0x02</code>, <code>0x08</code>, or <code>0x09</code>. That could happen if the first member file was not compressible, or was compressed with non-default options.