Hi - Looks like the Publish Target is set to AIR in your file and AIR SDK is needed to open such file. We used to package AIR SDK with Animate in 2018 but it has been removed later on and hence this dialog. File should get opened if you add the SDK by following the steps described in https://helpx.adobe.com/nl/animate/kb/get-started-with-latest-airsdk.html
However, could you please share one of the fla file with which you are facing this issue for us to validate from our side?
Thanks!
Mohan
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