# Module Extension Utility v1.0.21 released

**URL:** <https://forum.vassalengine.org/t/module-extension-utility-v1-0-21-released/90513>\
**Category:** Module Design\
**Created:** [September 15, 2026, 3:49am UTC](https://forum.vassalengine.org/t/module-extension-utility-v1-0-21-released/90513 "2026-09-15T03:49:03Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![delatbabel](https://forum.vassalengine.org/user_avatar/forum.vassalengine.org/delatbabel/32/3327_2.png) [@delatbabel](https://forum.vassalengine.org/u/delatbabel)\
**Post date:** [September 15, 2026, 3:49am UTC](https://forum.vassalengine.org/t/module-extension-utility-v1-0-21-released/90513/1 "2026-09-15T03:49:03Z")

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Version 1.0.21 of the Vassal module extension utility has been released:

> **[Release 1.0.21 · delatbabel/vassal\_extension\_utility](https://github.com/delatbabel/vassal_extension_utility/releases/tag/production-121)**
>
> A scenario batch uploads to the library in one command; a scenario can be given another game's maps from the Tools menu; the window has a light and a dark theme; saved games in VASSAL 3.8's new obf...

The most significant changes are:

- New features on the menu to swap maps between games – effectively allows you to take the maps from vsav A and swap them into vsav B. This is how we created multiple scenarios for WiF with different maps – populate the counters into the force pools for map option A, create a new empty scenario with map option B and combine the counters from A with the maps from B to give a new scenario C.
- New command line utility to bulk upload scenarios to the module library.
- Support for the new vsav compression feature introduced in Vassal 3.8.0.
- Introduced a theme engine with dark/light/system themes (FlatLaf).
- Able to report on and fix global properties within a saved game.
- Various bug fixes.