Here are the two Editors that I could locate, they work on the Roster.dat file.
WWEdit by Frederic. 2001
On Windows 10 this starts by flashing a dialog box that says "Wizards&Warriors directory not found!". Fortunately it then starts normally...
It covers: Name, the eight Stats, XP, level, max HP, current HP, role, levels in each Guild, Gold and levels in each Skill. Download:
WWEditor
PC Records Spreadsheet by me. 2016
I am working on a spreadsheet that will enable inventory editing. This will be done soon.
It is done for the time being. Download, see below:
Roster.dat Editor, by Fendris. 2000
It has five tabs: Attributes, Stats, Skills 1, Skills 2 and Treats.
("Treats" is a mis-spelling of Traits.)
Attributes covers the eight stats.
Stats covers current HP, max HP, Gold, XP and the Mana figures (current/maximum) for each of the six spellbooks. He has altered the names of two of the spellbooks, Suncraft and Fiendcraft.
Skills 1 covers half of the 32 Skills.
Skills 2 covers the other half of the Skills.
Treats covers the 66 Traits. They are listed in the order in which they occur in the save game file, which is not in any way alphabetical.
Editor mixes up the Zenmaster and Valkyrie classes.
Download, see below: