ZDoom

av_fix.wad contains five lumps:
DEHACKED
MAPINFO
M_ALIENV (optional)
M_NRFTL (optional)
STBAR

It's called "fix" because it contains more than just the STBAR images, it also has files for the map names. That's why it's not called _WIDE as usual. This file naming scheme is consistent throughout the collection. I hope this settles your confusion, and I can assure you, the statusbar is right there, fully functional and everything.

Ultrawide Statusbars
I've adapted NightFright's original widescreen statusbars into ultrawide versions, for those of us who like our Doom even W I D E R. Some of them have minor tweaks, some of them I took some more extensive liberties with. There's also a few HUDs for PWADs that aren't included in the regular widescreen pack, they might work as regular widescreen assets but I haven't tested.

I've included some instructions on how to get the ultrawide assets to look right in GZdoom in the text file, as it doesn't scale them up properly when letting it do its thing automatically, it needs some manual settings.

Here's a few I'm most proud of:

It's a giant waste of screen space, though. With literally nothing happening visually and functionally within those gaps that you fill with these additional graphics. It's the main reason why I am having a really hard time returning to this project. My attitude towards this approach has changed quite fundamentally.

I don't want to talk any of you guys out of using this stuff, obviously there's still some interest for this, but personally I have just moved on to the approach from the Fullscreen Statusbar Mod.

this works for doom campaigns as well not just for mods right?

The base games do not need this as GZDoom comes with widescreen graphics already.

Except for the Doom statusbar. Nash wrote that one doesn't offer anything interesting visually if extended, so he didn't include it.

what i mean is how do you have monster counts, items, secrets and the map name above status bar instead of top left corner?

With a code-based mod. Which this is not.