To change the default font for the Mail app in Windows 10, do the following. In Windows 7’s Control Panel, go to Default Programs, and then Set Default Programs. The Default font option applies per-account and does not roam to other devices. Starting with the Mail app version 1.20082, you can change the default font for a new mail or replies. See the following article:Ĭhange Mail App Background to Custom Color in Windows 10 In the Mail app, click the gear icon to open its Settings pane. Right-click on the zipped file and click properties. Note: You will require a zipped file for these methods. You can also set 7zip as the default file archiver from Windows Explorer as well. Tip: One of the features of the Mail app in Windows 10 is the ability to customize the app's background image. To change the default font for the Mail app in Windows 10, do the following. Method 2 Set 7zip as default from Windows Explorer.