Perfect, just needed the quotes for it to work. Thanks for the tip, I'll probably use the Environment Variables GUI in the future (if I need it) in order to not override previous settings.

Thanks for the fast answer.

setx FILEBOT_OPTS -DuseCreationDate=true
Works for the air date as creation date.

However on my Win10 Pro machine the modified date gets updated to the current date when I rename files. To fix this:
setx FILEBOT_OPTS -DuseExtendedFileAttributes=false

However I can ...

I've been using FileBot for a while and modified the ini settings in order to set the File creation date to when the episode originally aired. Since a 75% off promo is running right now I bought Filebot from the Windows Store.
Now I've looked everywhere (both on this forum and on my computer) and ...