|ya I just found the code i needed here is the result and it lets you test many files that were renamed from .txt to whatever and checks the known serials it works very well|
here is the code you will have to make a txt file with a key you want and a .vbs file named "key" to not get any errors (in the key.vbs i just put "Key file confirmed" so u can use what ever you want thanks again for the help and here is the code...
set /p FN=click and drag the .key file to this window:
IF NOT EXIST %FN% Goto error1.
ren %FN% %FN%.txt
echo %FN% decrypted successfuly
fc %FN% key1.txt > nul
if errorlevel 1 goto key2
fc %FN% key2.txt > nul
if errorlevel 1 goto key3
fc %FN% key3.txt > nul
if errorlevel 1 goto error1
echo THIS KEY FILE IS INCORRECT