change the default font of Times New Roman to Arial

You can change the default font of new documents. There are three files

you might want to look at-- Custom, shellnew.fm, and txttmplt. From the

FrameMaker help file:

"Change templates for blank paper and text files

You can change the custom template for blank paper so that it contains

the formats you want. The template can contain the same formats as any

other template, except for the page layout. The master page layout,

number of columns, and margins are determined when you create the blank

paper documents.

You can also change the custom template that FrameMaker uses when you

open text files.

Note: You can change the filename that FrameMaker looks for when it

creates a blank paper document or opens a text file.

Change the template for blank paper

1. Change a document so it contains the formats and settings you want.

Leave existing master pages empty and do not create custom master pages.

2. Remove all text frames from both the left and right master pages—even

if a document is single-sided. (If the document is single-sided, choose

Format > Page Layout > Pagination, select Double Sided, and click Set.

Then select and delete the text frames on the master pages.)

3. Choose Special > Delete Pages and delete all body pages.

4. Save the document, using the Custom (no file extension) file in the

FrameMaker fminit folder. (When you choose New > Adobe FrameMaker

document from the context menu in a folder or on the desktop, the

Shellnew.fm file is used.)

Change the template for text files

1. Change a document so it contains the formats and settings you want.

For example, you can place headers and footers, a Paragraph Catalog, and

master page graphics in the template document.

2. Delete all text on the body pages.

3. Click in the empty text frame on page 1, and tag it with the

paragraph format you want all text in the document to use. The default

template uses the Body paragraph format.

4. Save the document, using the txttmplt file in the FrameMaker fminit

folder."

If you are talking about what you see after using File > New, then as far as I remember all these standard files are just FrameMaker files stored in a specific location: so you can open one you want to change, adapt the fonts and save your changes. Of course, it might be better to save your adapted version under a new name …

On my laptop, the standard files show up under ProgramFiles(x86)/Adobe/Adobe FrameMaker 12/Templates