How to get Inno Setup to unzip a single file?

Question

Is there a way to unzip just one file from a zip? I'm using code based on response for How to get Inno Setup to unzip a file it installed (all as part of the one installation process), works perfect for unzip but don't have an idea how can it unzip a single file:

[Code]:

const
  NO_PROGRESS_BOX = 4;
  RESPOND_YES_TO_ALL = 16;

procedure UnZip(ZipPath, TargetPath: string); 
var
  Shell: Variant;
  ZipFile: Variant;
  TargetFolder: Variant;
begin
  Shell := CreateOleObject('Shell.Application');

  ZipFile := Shell.NameSpace(ZipPath);
  if VarIsClear(ZipFile) then
    RaiseException(Format('ZIP file "%s" does not exist or cannot be opened', [ZipPath]));

  TargetFolder := Shell.NameSpace(TargetPath);
  if VarIsClear(TargetFolder) then
    RaiseException(Format('Target path "%s" does not exist', [TargetPath]));

  TargetFolder.CopyHere(ZipFile.Items, NO_PROGRESS_BOX or RESPOND_YES_TO_ALL);
end;

Answer 1

Use Folder.ParseName to retrieve a reference to a specific file in a ZIP archive "folder". Then pass that reference to Folder.CopyHere to extract it.

const
  NO_PROGRESS_BOX = 4;
  RESPOND_YES_TO_ALL = 16;

procedure UnZip(ZipPath, FileName, TargetPath: string); 
var
  Shell: Variant;
  ZipFile: Variant;
  Item: Variant;
  TargetFolder: Variant;
begin
  Shell := CreateOleObject('Shell.Application');

  ZipFile := Shell.NameSpace(ZipPath);
  if VarIsClear(ZipFile) then
    RaiseException(Format('Cannot open ZIP file "%s" or does not exist', [ZipPath]));

  Item := ZipFile.ParseName(FileName);
  if VarIsClear(Item) then
    RaiseException(Format('Cannot find "%s" in "%s" ZIP file', [FileName, ZipPath]));

  TargetFolder := Shell.NameSpace(TargetPath);
  if VarIsClear(TargetFolder) then
    RaiseException(Format('Target path "%s" does not exist', [TargetPath]));

  TargetFolder.CopyHere(Item, NO_PROGRESS_BOX or RESPOND_YES_TO_ALL);
end;