DNG files

[Mazzarol]

I shoot in JPEG + DNG wide. While the JPEG file has no problems, the DNG one has just a 320x240 resolution, but the size is 41 Mb. Obviously this kind of file is totally useless.
Someone on this forum suggested that the PC maybe visualizes the embedded JPEG file, but the extension is still NG. I use ACDSee, Affinity and FastStone.
Can somebody help me?
Thanks

 

[ROBANAFI]

Have you tried importing the DNG into Affinity, processing it and then exporting it to .jpg?

 

[Mazzarol]

Have you tried importing the DNG into Affinity, processing it and then exporting it to .jpg?

I was inaccurate: Affinity read correctly the file; ACDSee doesn't and show just a kind of a large thumbnail. And, because I manage my files with ACDSee, this is very disappointing, because i can't properly decide which images I should post process. with Affinity.
Thank you for your kindness.