When installing a new application or program, these will often change your
file associations, so that associated files are launched by the new
application/program. If you had another application/program which was previously
associated with that file type, double-clicking will no longer start this
application/program, but the new one instead. Some programs offer you the choice
of associating certain file types with them when you run the Installation
program, but to help you setting the file associations yourself, here are two
tips:
1. A shortcut for choosing a new program to be used with a certain file type
is to hold the Shift key while right-clicking on a file, and choose
Open With... from the context menu. After choosing the program, place a
check-mark in the Always use this program to open this type of file
