[-)-MAILMAN-]

It would help to know precisely which SFS files they are in, but the tool will only work (even then)
if it knows (is programmed) with the names of files to be extracted in first place. un-preprogrammed files won't be found. One of them is called:
regiments.ini and others are:
country.properties
country_ru.properties
regInfo.properties
regInfo_ru.properties
regShort.properties
regShort_ru.properties

Finding any of the above in any the SFS files would help you define which files are concerned. Then looking for an existing squadron in there with such format as:
249Squadron.mat
249Squadron.tga
249Squadron

Don't know about HSFX, but with UP2, mods don't go on line, unless everyone else has them too.
So I don't see the point of adding something like 250Squadron if you do
not intend to share it entirely with the rest of the on-line community.

Besides you missed my point. The suggested mod, design for offline use
only, replaces and takes precedence over files in SFS. It is neither UP or HSFX, although about 80% included within these. Studying it
would be easier then studying SFS files directly. The info given here comes from that mod. Even if you find what you want, modifying and adding is still creating a mod.

By the way I have created hundreds of new squadrons as MODs:
viewtopic.php?f=76&t=28706
viewtopic.php?f=76&t=28720
viewtopic.php?f=76&t=28727

I didn't miss your point.

I had already found and edited the below files, but those alone don't add a squadron to the game.

C:\Ubisoft\IL-2 Sturmovik 1946\Files\i18n

country.properties
country_ru.properties
regInfo.properties
regInfo_ru.properties
regShort.properties
regShort_ru.properties

The below files that you listed I will have to find. (Anyone know which fb_3do or fb_hfx3do .sfs file contains this information?)

regiments.ini

249Squadron.mat
249Squadron.tga
249Squadron

The plan is to edit a file or create a mod in order to add a squadron as our little group (about a half dozen who fly together on Friday nights when one of us hosts, not on HyperLobby) is needed and I would certainly pass this information along for anyone to use.