Question working with files problem

[thefalcon79]

hi all

i have this scenario

The Result exe File:
----------------------------------------------------------
| firstFile | label | password | sizeOfSecondFile | secondFile |
----------------------------------------------------------

Label = "**"
sizeOfSecondFile stored in 16 byte block size

i could merge two files and included an label (string = **) after the first file.
the result file merged successfully with no error's. but, now, i'm trying to extract/restore these files and facing a problem in how to read the '**' label from the result file to detect the first file size !!!

any idea ?