Well that isn't DOS, it's the old Edit.exe utility from late DOS through Win9X and NT.
Hard to see the advantages over NotePad.
BTW - Upgrade to Win2K/WinXP if you are on Win9x yet. NotePad gets Edit|Go To... and Edit|Replace...
Also in all Windows versions be sure to install Script Debugger. Makes a handy web editor, but you'll want to create a shortcut. It normally installs as:
C:\Program Files\Microsoft Script Debugger\msscrdbg.exe
Script Debugger is an MDI application (can open multiple files at once) and it color-codes ASP tags and HTML too! ;-)
And don't forget... it can be used to debug your ASP pages as well if properly installed on the server.