Add punctuation: In the case that your TM file doesnt open it is highly likely that you do not have the correct software application installed on your PC to view or edit TM file extensions
A: In the case that your TM file doesn't open, it is highly likely that you do not have the correct software application installed on your PC to view or edit TM file extensions.

Add punctuation: Phitsanoluk located 390 kilometers north of Bangkok A river divides the city into two parts but the real attraction is Wat Mahathat with its golden Buddha Chinarat which apparently is known for its healing powers
A: Phitsanoluk located 390 kilometers north of Bangkok. A river divides the city into two parts, but the real attraction is Wat Mahathat with its golden Buddha Chinarat which apparently is known for its healing powers.

Add punctuation: A thoracic radiograph chest xray might help to determine whether there is enlargement of the heart or any other evidence of heart failure
A:
A thoracic radiograph (chest x-ray) might help to determine whether there is enlargement of the heart, or any other evidence of heart failure.