I think you are just looking for the >WAD Tool. No need to make custom version of 7-zip to add support for an obscure ( ) game archive format. Dedicated is the way to go here.

Well adding support was just one way of doing it. I was sayuing Id like to be able to add/delete/extract individual files from an already compiled Wad. it would make it much less complicated to create custom levels with wads instead of data method.

You'd still want to have a dedicated tool for that rather than making a custom 7-zip build. Although WAD Tool does not extract individual files, it makes it easier to view the contents. What's wrong with the data method that makes it complicated, anyway? Much better than using compiled WADs for development and playing, IMO (I prefer extracted over compressed any day). Plus, if you use >Patchman, you only set it up for the WAD method and it handles the WAD vs Data method installation for you.

as I said that was only one way i suggested.

actually it doe extract individual files it just doesnt allow you to add/delete individual files for the wad

I meant that creating mods with wads instead of data method is currently more complicated.

Honestly it would be easier to create a program to do this instead of adding it to some fork of 7zip. Extracting individual files is easy enough, but you can't add or remove files without rebuilding the entire archive each time.

but you can't add or remove files without rebuilding the entire archive each time.

This. I wanted to say this, but I was too lazy to do so. Picking individual files from an archive would require what Doc said, and unless the file selections were queued for extraction/addition and all the commands run at once, that would be a slow operation each time a file is edited (and even then, it'd be best for it to extract the archives and simply copy/paste the extracted file to/from the desired location, Data method, basically).

but you can't add or remove files without rebuilding the entire archive each time.

Okay first off it is possible the confusion here is due to a mistake on my part, is the wad not basically a custom type of zip file with a custom compression method? assuming that it is then doing so should be possible because I tested 7zip on a larger zip file and confirmed it does not rebuild the entire archive when you add/delete inividual files. so WAS I wrong about it being some sort of custom archive type?

1. Formats that allow individual extraction/addition must be designed that way. The WAD format was not designed for such manipulation. Thus

you can't add or remove files without rebuilding the entire archive each time.

is a valid statement.

2.  The WAD format is a completely custom format, and is not a modified ZIP archive.

thats waht i was trying to figure out. oh well.