the latter was never released under a license that allows creation of derivative works. In addition, DN OSP contains modified parts of the Virtual Pascal runtime library, while the license for Virtual Pascal itself prohibits distribution of modified versions, however, it is not clear whether this applies only to the compiler or to the runtime library too. Legacy Other groups release software based on the DN open source code, including features such as support for long filenames, and support for Linux. DN 1.51 650 KB for Win32 & OS/2 - Sources (Virtual Pascal) (972,655) DOS Navigator Open Source Project (ODN) dn2l Linux port based on DN OSP source code DN OSP 6.4.0 1 MB for DOS/DPMI (Windows 9x) Necromancer's DOS Navigator (NDN) DN 4.9.0 2004 for DOS included in Ultimate Boot CD (UBCD) v3.4 See also Orthodox file manager Comparison of file managers References External links DN Line - a Breakthrough in VFS, Softpanorama DOS Navigator Open Source Project DOS Navigator/2 Open Source Project ver. 2 Necromancer's DOS Navigator, Branch of original DOS Navigator it currently runs on DOS, Windows and Linux Necromancer's DOS Navigator new versions also 64-bit DOS and Windows Orthodox file managers Free file managers DOS software Software using the BSD license OS/2 software