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.
In Spanish, the letter s is pronounced exactly as in English. The letter z is pronounced the same, as an s in Latin America, however in Spain it is pronounced similar to th as in the word thin. Note: The examples below are with the Latin American pronunciation.