right. you have now selected
bytes from start offset 0 to end offset 1F (= 20 - 1).
0x0 - 0x1F
View attachment 5826731
on the left column you see offsets
. on the bottom you see block selected 0-1F
+ length 20
these two lines with ctrl + C. it is now in clipboard.
next, in menu 'File' -> create new
the two lines from clipboard into new file with ctrl + V.
now, in menu 'File' -> save the file ->
congratulations, you have extracted your first file yourself.