these kind of img files are partition images of linux file systems, sometimes sparsed with simg2img to reduce file size.
usually, partition images can mounted in linux only, same as partitions. windows is not capable of mounting linux file systems natively.
"extracting" linux images on windows is just some nasty hack and not intended for "repacking", because windows file system (NTFS) cannot handle linux file names and its metadata (like permissions, uid/gid, secontext)
the proper way is to mount (EXT4) partition image on linux, delete files, and unmount it.
additionally it might need img2simg/simg2img (not for dynamic partitions on super partition)