The company Winternals (later purchased by Microsoft

Microsoft

Microsoft Corporation is an American public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions...

) used to provide three kinds of programs for DOS

DOS

DOS, short for "Disk Operating System", is an acronym for several closely related operating systems that dominated the IBM PC compatible market between 1981 and 1995, or until about 2000 if one includes the partially DOS-based Microsoft Windows versions 95, 98, and Millennium Edition.Related...

 that could handle NTFS

NTFS

NTFS is the standard file system of Windows NT, including its later versions Windows 2000, Windows XP, Windows Server 2003, Windows Server 2008, Windows Vista, and Windows 7....

 formatted drives.

NTFSDOS

The first program was NTFSDOS - a freeware utility for DOS (NTFSDOS.EXE) that allows read-only access to NTFS formatted drives from a DOS environment.

NTFSDOS Tools

The second program was NTFSDOS Tools - an add-on package for NTFSDOS that contains two commercial utilities for DOS - NTFSCopy and NTFSRen. The former (NTFSCOPY.EXE) could be used to overwrite corrupt files with fresh versions. The latter (NTFSREN.EXE) could be used to change the names of bad drivers so Windows wouldn't load them.

NTFSDOS Professional

The final program was NTFSDOS Professional - a whole commercial solution for handling read and write operations in NTFS from a DOS environment. It must be installed as a package for Microsoft Windows

Microsoft Windows

Microsoft Windows is a series of operating systems produced by Microsoft.Microsoft introduced an operating environment named Windows on November 20, 1985 as an add-on to MS-DOS in response to the growing interest in graphical user interfaces . Microsoft Windows came to dominate the world's personal...

 first.

The downloaded version comes in demoware form. The user can only use the package in read-only mode in order to evaluate it.

Commercial NTFSDOS packages become abandonware

Winternals was acquired by Microsoft mid 2006. Microsoft has removed any traces of NTFSDOS, NTFSDOS Tools and NTFSDOS Professional from the new internal site of Microsoft's Winternals' utilities.