Address book file is a sequence of following records:

  TAddrRecType = packed record
    Shortcut: string[128];
    Name: string[128];
    Email: string[128];
  end;

About Pascal strings:

string[n] takes n+1 bytes.  0th byte of a record is an actual length of string.

For example, string[6], which contains the string "test" (without quotes) will be
represented as

04 74 65 73 74 00 00

Last two 00 00 can be any random value.