Hi! Holger,   
      
   On 21/09/2015 9:45 AM, you wrote to Mark Lewis:   
      
    HG> Thanks for the info. Of course I have noticed the first two characters   
    HG> of ZIP-files but I can't recall having seen PK up there in the top left   
    HG> corner. "MZ" plus an additional character seem to be common in both   
    HG> normal and PKLited files.   
      
   That's for .EXE programs.  (FWIW, the "MZ" stands for Mark Zbikowksi who was   
   the principal architect of DOS.)  PK was part of the company name PKware, of   
   .ZIP fame.   
      
   Cheers,   
   Paul.   
      
   --- Mozilla/5.0 (Windows NT 5.1; rv:31.0) Gecko/20100101 Thunderbird/31.7.0   
    * Origin: Paul's other Linux vBox - Maryborough, Qld, OZ (3:640/1384)