HOI4 Utilities 2026

This extension add preview tools to Hearts of Iron 4 coding. This is a continuation project based on the HOI4 mod utilities from herbix

Features

Install and enable this extension in VSCode.
Set Heart of Iron IV install path. You can:
- (Since v0.7.0, or on vscode web) Open command palette using Ctrl+Shift+P. Use command Select HOI4 install path to browse the folder that installed Heart of Iron IV.
- Update setting mdHoi4Utilities.installPath (you can open settings page of VSCode using Ctrl+,) to the folder that installed Heart of Iron IV.
Open your mod develop folder.
(Optional) Open command palette using Ctrl+Shift+P. Use command Select mod file to set working mod descriptor (the .mod file).
Use these entries:
- Command palette (Ctrl+Shift+P) commands: Preview World Map and Preview HOI4 file*.
- Preview HOI4 file button on right-top tool bar of text editor.
- Open a .dds or .tga file.

Setting	Type	Description
`hoi4ModUtilities.installPath`	`string`	Hearts of Iron IV install path. Without this, most features are broken.
`hoi4ModUtilities.loadDlcContents`	`boolean`	Whether to load DLC images when previewing files. Enabling this will use more memory (All DLCs are around 600MB).
`hoi4ModUtilities.modFile`	`string`	Path to the working `.mod` file. This file is used to read replace_path. If not specified, will use first `.mod` file in first folder of the workspace.
`hoi4ModUtilities.enableSupplyArea`	`boolean`	If you are developing mod for HOI4(version<=1.10). Use this to check enable supply area.
`hoi4ModUtilities.previewLocalisation`	`enum`	Language of content in event tree preview.
`hoi4ModUtilities.featureFlags`	`array` of `string`	Feature flags are used to disable or enable features. Reloading is required after changing this.

GUI of focus tree can't be configured like technology tree.
Edge lines on world map not alway fit edge of colors.
Event tree preview will duplicate events even they are same event if they are from different option.