The file extension FT8 was used for templates of freehand version 8 vector graphics software. In these templates, various settings such as dimensions and graphic elements can be included, which serve as a basis for a design (eg business cards, flyers).
Freehand was originally developed by Altsys and distributed by Aldus. In 1994 Freehand was bought by Macromedia. After Adobe took over the company, the development of Freehand was discontinued in favor of Adobe Illustrator. Freehand is still available in the MX version, but only supports older versions of Microsoft Windows and Apple Mac OSX.
Usually the number of the Freehand version is appended to the extension ft, eg Ft8. Many programs only support opening files with these special endings.