Change Default Program For File Type On Mac
This is how you can change the default application for any type of file on your Mac OS. Try this on your Mac and share your experience with us in the comment box. Try this on your Mac and share your experience with us in the comment box. You need to replace the ICNS file inside the program that is assigned as the default program for the specific file type. 1 - Create an image for the desired icon, then save as a png filetype (png supports transparency).
Many types of files are registered in Windows 7, Windows 8, and Windows 10 to be opened by a particular program by default. For example, Notepad typically starts when you open a text (.txt) file. However, you can change which program — including the default settings — opens files of a certain type.

On the Start menu, click Settings.
Click Apps > Default apps.
Click the App you want to change, and then select an App from the list. You can also find new apps in Microsoft Store. Apps must be installed before you can set them as the default.
OR
To choose default apps by file type, scroll down the page, and click the link Choose default apps by file type.
You can change the default settings for new documents by making changes to the Normal template that new documents are based on. You can modify the Normal template to change its default formatting or content so that any new document that you create will use the new settings.
Important: If you mistakenly modify the Normal template, you can easily restore the default behavior by deleting, renaming, or moving it. The Normal template is automatically recreated the next time that you open Word. However, the same cannot be said for other templates. You should always create a copy of any other template before you change it.
Change the default font
Changing the default font in any template means that the font is used in every new document that is based on that template. For example, the default font for new blank documents is based on the Normal template.
Open the template or a document based on the template whose default settings you want to change.
On the Format menu, click Font, and then click the Font tab.
Make any changes that you want, and then click Default.
Note: Most of the styles in Word are based on the Normal style. Changing the default font also changes the Normal style, which affects any other style that is built on the Normal style.
Change the default character spacing
What Is A File Type?
Changing the default character spacing in any template means that the settings for scale, spacing, position, kerning, and other typographic features are used in every new document that is based on that template. For example, the character spacing for new blank documents is based on the Normal template.
Open the template or a document based on the template whose default settings you want to change.
On the Format menu, click Font, and then click the Advanced tab.
Make any changes that you want, and then click Default.
Change the default margins
Changing the default margins in any template means that the margin settings are used in every new document that is based on that template. For example, the margins for new blank documents are based on the Normal template.
Open the template or a document based on the template whose default settings you want to change.
On the Format menu, click Document, and then click the Margins tab.
Make any changes that you want, and then click Default.
Change the default layout
Changing the default layout in any template means that the section breaks, headers and footers, and other layout attributes are used in every new document that is based on that template. For example, the layout attributes for new blank documents are based on the Normal template.
Open the template or a document based on the template whose default settings you want to change.
On the Format menu, click Document, and then click the Layout tab.
Make any changes that you want, and then click Default.
Change other default settings in the Normal template
You can customize the Normal template and change default settings for many aspects of a document, such as text formatting, paragraph formatting, document formatting, styles, text, pictures, AutoText entries, and keyboard shortcuts. To make changes to Normal.dotm, you must open the file from Word. If you open Normal.dotm from the Finder, Word will create a new blank document based on the template.
Default Programs On Mac
On the File menu, click Open.
In the Open dialog box, browse to the folder that contains the Normal.dotm file.
If you are using Word 2016 for Mac, go to /Users/username/Library/Group Containers/UBF8T346G9.Office/User Content/Templates
If you are using Word for Mac 2011, go to /Users/username/Library/Application Support/Microsoft/Office/User Templates/My Templates
Note: If you are using Mac OS X 10.7 (Lion), the Library folder is hidden by default. To browse to the Library folder from the Open dialog box, press COMMAND + SHIFT + G , and in the Go to folder box, type ~/Library.
Double-click Normal.dotm. The Normal template opens.
In the Normal template, make the changes that you want.
Save and close the Normal template.
Tips:
If you make extensive changes to your Normal template, we recommend that you periodically back up the file. To back up your Normal template, copy the file and rename it, or move it to another location.
You can quickly and easily format a whole document to give it a professional and modern look by applying a document theme. A document theme is a set of formatting choices that can include a color scheme (a set of colors), a font scheme (a set of heading and body text fonts), and an effects scheme (a set of lines and fill effects). To apply a theme:
In Word 2016 for Mac, on the Design tab, click Themes, and then choose a theme.
In Word for Mac 2011, on the Home tab, under Themes, click Themes, and then choose a theme.
You can change the page margins in your doc and create custom margins. But the next time you create a new document, Word for the web will revert to the Normal margin setting of one inch on each side of the page.