>Has anyone found a dll that allows
>to extract a file from the zip archive that contains
>a file system with multiple folders and subfolders, without extracting the entire archive?

Being ZipFile the source zip file, FileOrFolderToExtract the name of the file or folder (tree) to extract, located anywhere in the zip file structure, and TargetFolder the location where extracted file(s) will be stored, like in:

m.ZipFile = GETFILE("Zip")
m.FileOrFolderToExtract = "Configurations2\accelerator\current.xml"
m.TargetFolder = FULLPATH(SET("Default"))

then

m.Shell = CREATEOBJECT("Shell.Application")

m.Shell.NameSpace(m.TargetFolder).CopyHere(m.Shell.NameSpace(m.ZipFile).items.Item(m.FileOrFolderToExtract))

extracts the selected file(s).