Chest pain is an umbrella term to describe any pain or discomfort in the chest area (image of chest area). It may feel dull or sharp, last a few seconds to a few hours, occur in one spot or spread across the width of the body and down the arms.
file name - (computer science) the name given to a computer file in order to distinguish it from other files; may contain an extension that indicates the type of file. computer file name, computer filename, filename.
A file extension is the set of three or four characters at the end of a filename; in this case, .tst. File extensions tell you what type of file it is, and tell Windows what programs can open it.