Hi Vincent, thank you for your quick reply.
My astro cams (both ZWO) afford saving in fits or tiff.
I have minimized my use of fits files, since they require apps that can convert/save in tiff, for post processing. I do not use the costly post processing apps such as PI and APP. I start in Siril, and then use Affinity photo ($40USD).
Even Siril needs to re-convert fits files in order to produce the sequenceSo i desire all processings to be as simple as possible.
I hope your team will reconsider allowing the Siril comet registration to use the tiff filename time/date to be used.
Thanks again.
Fivel