### how to sage a .sage file

I am having sage installed on a windows 10. Sage file example.sage.sage which is generated by sagetex is situated in K:\sageexample folder. How to run sage on this file. All references are full of jargonism and don't explain anything at all or give examples.
I run sage shell and prompt:
run ('K:sageexample\example.sage.sage') but no result. I run load command load ('K:sageexample\example.sage.sage') no example.
I don't want to install linux for one program.
How to "sage" a file from notebook interface?