This process was sometimes called linkage editing and the output known as a load module. A compiler works with what are sometimes called 3GL and higher-level languages. An assembler works on programs written using a processor's assembler language.
In general, however, when between vowels (as in exactamente) the Spanish x is pronounced like the English ks sound but softer or less explosive. When it comes before another consonant (as in expediciÃ³n), it has the s sound in some regions/countries but the soft ks sound in others.
-- Words in Spanish use the acute E (Ã©) to indicate an E that is pronounced separately, but it has the same sound as E does normally. In Spanish this is called a tilde, whereas in English the term is applied to the mark used over an n (Ã±).