[command] Batch save files contained in a folder

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You can try some of these solutions, anyway I would recommend you to use a Bash script which are easier to program (generally all Git distributions for Windows include some kind of Bash interpreter), where you can do something like:

aseprite=“C:/Program Files (x86)/Steam/steamapps/common/Aseprite/aseprite.exe”
for file in D:/PATH_LOAD/*.ase ; do
  $aseprite -b $file --save-as D:/PATH_SAVE/{title}_{tag}_01.png
done