file type is not included in the list of types to choose from to associate a file with

[Paula Rae]

in "Choose default apps by file type" in Windows 10, there are two file types that are not listed; how do I add a file type to the list so that I can associate that file type with a file. For example, I often receive a file that has a file type of .stmt and another fle with a file with the name viewdoc.file. They are both PDF files. But neither of these file types are available for me to choose from in the default list. How do I add them?

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