Hi Fabio,
One small thing I really miss, is that AstroArt could show thumbnail preview of fits files in windows file explorer.
https://docs.microsoft.com/en-us/window ... ilprovider
IThumbnailProvider
Re: IThumbnailProvider
It would be even better to write a small free program for that, just like we did with our FITS viewer: http://www.msbsoftware.it/avis/ . I will consider it in the future, thanks.
Re: IThumbnailProvider
No, and I think they could not. The program should be quick and "invisible", often they are implemented as DLLs.