XnView Software

@XnTriq
Thx for the references. And 'nvddsinfo' was exactly what I needed. I've attached my batchfile for anyone interested (incl nvddsinfo).
So, nvddsinfo is able to identify 'weathered_rock_a_n.dds' as well...
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As suggested, I've attached 1 file which does not "show" in Xnview. It will open in DDS viewer though. This file is part of 3 files, nl:
weathered_rock_a_d.dds
weathered_rock_a_n.dds
weathered_rock_a_s.dds
There are many of those file combos, and if Xnview is able to show its content/info as well ...

I have been testing/viewing DDS files with Xnview this week. While DDS Viewer (nicolasweber_gmx.de) was able to view most files, Xnview did not show/open particular DDS files. I'm not familiar with DDS internal file structures, so I was wondering if I could provide/upload a few of those as example ...