To be able to use 3D wireframe you have to get the 3D acceleration working with the XWA Wrapper created by Reimar Döffinger. It's a simple fix that requires to copy two configuration files ddraw.cfg and ddraw.dll to the X-Wing remastered directory.
It's explained in great detail over here:
https://psteamcommunity.yuanyoumao.com/app/354430/discussions/0/620712999979167350/

Thanks teleguy for making this.

Once your 3D accelerated X-Wing 1998 is working and you had enuff of the fancy textures, you can go on and modify the ddraw.cfg for retro wireframe look.
Here's how: Browse to the X-Wing Remastered file folder. (right click the game properties/ local files/ browse local files ..go to remastered.
if you did your 3d Acceleration fix right, which I assume you did. You should have the ddraw.cfg sitting in that folder.
Open the file with the Windows editor and find the segments that reads: Fillwireframe=0
change the 0 to a 1 and hit save.
You might find that there are other handy options like aspect ratio, anti aliasing, texture filtering etc there too...but I wont go any of those here, since it is documented in the file itself too.


When ingame you might want to turn of Planets and Galaxies in the Inflight Options
as they wil come out as boring rectangles that don't do anything.
Here's a screenshot of the a Nebulon B Frigate in wireframe.
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1576532761*
Trench Run:
https://psteamcommunity.yuanyoumao.com/sharedfiles/filedetails/?id=1577028654

To go back to the original setting simply reverse the steps above and replace the 1 with a 0 again.

I won't take any responsibility if you ruin your installation or your life by using this Wireframe mode.