Question:
How do I use the LzExpand functions in my application? 
Answer:
Here is an example that will decompress a file that was compressed
using the Microsoft compress.exe utility utilizing the -r (rename) 
command line switch. Note: If you already know the expanded name of 
the file, or it was not compressed with the -r command line switch, 
then simply omit the code associated with the GetExpandedName 
function, and directly hard code the file name as needed.
uses LzExpand;
{$IFNDEF WIN32}
const MAX_PATH = 144;
{$ENDIF}
procedure TForm1.Button1Click(Sender: TObject);
var lpDstFileName : PChar;
 SrcFile : integer;
 DstFile : integer;
 SrcOs : TOFSTRUCT;
 DstOs : TOFSTRUCT;
begin
 GetMem(lpDstFileName, MAX_PATH);
 GetExpandedName('C:\TestFile.bi_', lpDstFileName);
 SrcFile := LZOpenFile('C:\TestFile.bi_', SrcOs, OF_READ);
 DstFile := LZOpenFile(lpDstFileName, DstOs, OF_CREATE);
 LZCopy(SrcFile, DstFile);
 LZClose(SrcFile);
 LZClose(DstFile);
 FreeMem(lpDstFileName, MAX_PATH);
end;