XnviewMP 1.8.6: DDS files are missing mipmap layers.

[b1k3rdude]

XnView: MP 1.8.6 64 bit
OS: Windows 10 22H2/64bit
Effect: Cant open the files in GIMP 2 to verify said files, get "Requested data exceeds size of file" error popup in-gimp (see attached)

To reproduce:
1. open an image and save it to .DDS
2. try to open the image in GIMP.
3. you get the following errors in GIMP (see attached).
4. Opening and re-saving DDS files in Paint.net fixes the error and creates the missing mipmap layers.

Expected behaviour:
- For XnviewMP to correctly output/save .DDS files so they include mipmap layer. On a side not, I am able to open said files in GIMP 3 rc3 (and dont get the error) but the mipmap layers are still showing as not present.
- would be handy to have the ability choose DXT compression on single and batch actions.

[xnview]

Thanks to your detailed description I can reproduce the problem.

[xnview]

This problem is supposed to be fixed in XnView MP 1.8.7. Please check and confirm the bug fix here.