Import issue

[Sinfolke]

On Windows when i try to use import from another file it shows an error: In console then it outputs:

test.ts:1:1: error: String.ts: Can't open: Unknown error (0xC1)
import String from 'String.ts';
^
test.ts:1:1: error: failed statement
import String from 'String.ts';
^

if the file is not with extensoin .ts the program waits for several seconds and quit out. I assume it attempts to run the file but it is a text document