[Other] monster.dat, magic.dat, stditem.dat

for what files are this? if its for 3.38 or lower i remember to used a tool for decrypt them.. like setup.txt editor for 3.55

you need job files to edit them, there is a editor for them

i mean this, found at LSJOB.zip , Envir Folder, its called Mir3Param.. have a look on it

Database encryption mode has changed

Do you know, use the same encryption but different structure.
The encryption its easy, use plain encryption xoring...
To get the key in this type of method its easy, only open the file with a hex editor,
and when you see a number repeats a lot this is the key to xor them because, if you xor to 0 then the result is the key...xD once xor the bytes, convert to ascii and now you can see the names., etc..
If you take a look you see a byte before text in stditem.dat...that byte is the length of the name of the
current item...
for easy look, save it the result to file and open again usin hex editor..
then try to look for start position to start decoding the structure, the rest of data could be the filled values... you need to decode field size, if is a byte, short, integer, long values to fill correctly and when finish with the first entry go next following byte to byte..
You need to recreate the structure once decrypted to match to your fields to fill them.

Have a nice learning..