By Adding or Removing File type extensions from the list of
file name extension in SharePoint search, Search index will include/exclude the
properties from files that we have added or removed. To include a file type in
search, we have to check that the file type will support for default or any
third party filter-based in SharePoint search.
To add a file name extension to the Manager File Types page,
Navigate to Application Management in SharePoint Central
Administration and click on Manage Service Applications link.
In the list of service applications, select Search Service
Application.
On the Search Administration page, Click on File Types in
Crawling section. We can see the Manage File Types page.
Click on New File Type and in the File Extension box We have
to provide the file type to add and click on Ok.
We can the File type extension in the list of file types on
Manage File types page.
To remove the file types select the file type in the list of
file types and select delete to remove.