Here is an outdated app, the mindmup desktop version 0.0.0.14_0 (offline) for chrome/chromium browser.

To install, from your chrome, load this folder by setting|extensions|load unpacked extension.

This APP is from Google Play Store. After Google removed this from their store, I recovered these files from my old computer's Chromium's browser. The folder _metadata is removed, so you can install it from local file system.

open mindmup file in other mindmap applications

1. convert the mindmup file to mm format
2. import the converted mm file from other application