How can we set the original orientation of an image file such that when the image is opened in a different application   the original orientation is a sagittal viewport?

For the file aseg.mgz in the below directory based on your tutorial, could you please tell a specific command to convert aseg.mgz to a file with sagittal viewport as the original orientation?

tutorial_data_20190918_1558/practice_with_data/Subj001/mri/aseg.mgz

Thank you in advance!

Best regards

Haiyun