User`s guide

In the General preferences pane, the option to check the
validity of each song added to the playlist is given. If this
option is checked, each song will be checked to see if it
is a valid audio file before opening it to the playlist. The
down-side of having this option enabled is that it will
take longer to open playlists due to this checking. For
very long set lists on slower computers, it may be
desirable to have this option turned o".
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