.TEMPLATE File

The template file extension is commonly used for various templates, for both documents or other file types. 

The term template when used in the context of file format refers to a common feature of many software applications that define a unique file format intended specifically for that particular application.

Template file formats are those whose file extension indicates that the file type is intended as a starting point from which to create other files.

Files with template file extension can be typically found as various document or project templates. Used in several unrelated programs.

How to open:

Specific templates can be only opened in specific program and are usually not supported outside the original program.

How to convert:

Templates can be usually exported to some final format.