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Sorry, no plans for that. FastRawViewer is focused on out-of-camera images (RAW, JPEG, HEIC/HEIF, TIFF) and very limited set of other image formats (TIFF, PNG).

We do not have any plans to extend it to '600+ image formats are supported', there are a lot of other viewers for that.

According to NASA site, multiple FIT(S) viewers are available: https://fits.gsfc.nasa.gov/fits_viewer.html

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Alex Tutubalin/FastRawViewer team