I'd like to open FITS files in CC

Here is a link to one of the .fits files I am trying to work with in my drop box.

https://www.dropbox.com/scl/fi/1msnihi9y6tzczh38q5ou/Stacked_C-49_10.0s_IRCUT_20240201-233114.fit?rlkey=2ileckcw04d1kkwvmj0k46iu4&dl=0

Well, got rained out of the plans so gave it another try............from their converter I choose TIF, JPG, and PNG, all producted the same results a zip folder with three black images that have no content unless they are opened in a program that can stretch the images...........it's as if all the converter ends up doing is changing the extension, but the file content is still in FITS format.  Be happy to send you FITS file if there is a way to do that in this forum, or I can put one in my Drop Box and send you the link.................

Wish I could test more but dont have a FITS file readily available. Will try to download one from the Hubble site later.

Out of pocket right now.............will give that a try later or tomorrow, and many thanks for your assistance.

Change the extension to .tif not .tiff

Same problem, the .tiff it generats is not an PS editable image, you still have to open the file in Siril or some other astro editing program to strecth the image and then save it again as a .tiff from that program to get something you can edit in PS.  Thanks for trying...............

https://www.vertopal.com/en/convert/fits

is an online converter. Try that if you need simplicity.

Looked at it, beyond my scope as yet..........download is not available, unless you go to some other site, on-line version has menu items I don't as yet have a clue as to how to use.   I just need something that will open a .fits file as a stretched image and let me save it as a .tiff for working in PS.  Thanks for the feedback, and will continue to give it a look to see if I can figure it out............meanwhile, still looking.

Tried that, followed the recommended install steps, choose the executable, actions, scripts, and plugins folders.........but when I start PS it says one or more plugins is not available, and if I try to open a .fits file it says PS cannot open.  Back to the drawing board.....................

ImageJ will open FITS files and has analysis functions, being a scientific imaging app.

imagej.net