woo if I cancel the infinite loop the file becomes more than 1GB...

OK then return to the starting point...

Set in default ini ... we see
[External compressorzlib]
header = 0
packcmd = pZLib e -m2 -t2 - -o - <stdin> <stdout>
unpackcmd = pZLib d -t2 - -o - <stdin> <stdout>
Result.
"dt15_win.cpk" will be your nightmare tonight...
