typedef struct _xcdZippingMemoryFileParams
{
  const WORD wStructSize; 
  const HXCEEDZIP hZip; 
  const LONG lUserTag; 
  const TCHAR szFilename[ MAX_PATH ]; 
  BYTE * pbDataToCompress; 
  DWORD dwDataSize; 
  BOOL bEndOfData; 
} xcdZippingMemoryFileParams;

This structure is available in both ANSI and UNICODE versions.