This app lets you run Windows on your Android phone:
The app you are referring to is called Winlator. It is a free app that allows you to run Windows on your Android phone.
To install Winlator, you need to follow these steps:
Enable Unknown Sources on your phone. To do this, go to Settings > Security > Unknown Sources and toggle the switch to on.
Download the Winlator APK file from GitHub.
Install the APK file on your phone.
Open the Winlator app.
The app will ask you to download an OBB file. Download the OBB file and install it.
Winlator will now be able to run Windows on your Android phone.
Here are some things to keep in mind when using Winlator:
The app is still under development, so there may be some bugs.
The performance of Windows on your Android phone will depend on the specifications of your phone.
You can only run 32-bit versions of Windows on your Android phone.
If you want to run a 64-bit version of Windows, you can use a different app called Box4Droid. However, Box4Droid is not as easy to use as Winlator.
I hope this helps! Let me know if you have any other questions.