HoMM 3 HD mod(aka HiRez mod, Multi-Resolution patch, HoMM3 High Resolution Project) is an addon pack for Heroes of Might and Magic 3 that changes game resolution to any from 800×600 to 4000×4000, adds new functionality and fixes some original bugs.
HoMM 3 HD mod will not change original gameplay.

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Compability: the Shadow of Death, Complete, WoG, TE, WT, and some other SoD/WoG/TE-based mods

HD mod features (except simple adventure manager resizing and converting ex-full-screens to windows):

* fixes some original interface bugs;
* 32-bit color mode support;
* minimap works correctly with nonstandard maps from 1×1 to 255×255
* extended adventure manager:

– 8 heroes and 7 towns in lists, + five buttons from adventure options;
– can view hero’s current number of movement points/ maximum number of movement points;

* extended army management (OFF in WoG/TE by default, cause incorrect work with creature’s exp):

– 17 new buttons on Swap Manager;
– managing army in Hero-Info-Panel on Adventure Manager;
– if moving last army from hero, 1 creature stay with hero and others move;
– quick split/combine/transfer creatures by [ctrl]+click, [alt]+click, [shift]+click.

* Extra buttons (“Load Game” “Restart Scenario”, “Main Menu”) in the Combat Options dialog;

* Artifact Merchants bugs fix;
* built-in Berserker’s CPU patch;
* easy DEF, PCX, TXT, FNT adding/replacing by putting it to \HiResData\Common (which have higher priority than \DATA and LODs)
* WoG/TE mod-makers can easily add new buttons to Adventure Manager ( \HiResData\Buttons.ini)

You can turn off most of the HD mod features using Options file \HiRezData\HiRez.ini

800×600 original game still works as it should after HD mod installation (no need to make any copy for backup)