[Mobhack]

The LBM number is stored as a file beginning with PM00000, where the numbers field mask is 5 zeroes.LBM, and the ID number fills the appropriate columns from the right, ie the number of leading zeroes increases as the LBM number decreases.

So Picture ID in Mobhack of 9373 translates to PM09373.lbm as 9373 has 4 decimal columns.
Picture ID of 373 would give you PM00373.LBM as 373 is 3 decimal columns.
and 73 would be PM00073.lbm as it only has 2 decimal columns.