Hi,
>>"can I open an existing DXF file in my own created template."
No
>>"and set this as the default that all files are opened in my self-made template"
No
Templates are for creating NEW files. There is no native feature to change an existing file by open command (what you want to do in fact),
but you can setup your program to work similar to what you want.
Read more about automation and acaddoc.lsp for example,
but it has less to do with a .dwt file.
