You're inside a ForEach Loop correct?
You can set a condition on one of your constraints based on the expression below to prevent further execution where @file_name is the variable mapped from your loop.
RIGHT(@file_name,6) != "_0.txt"
If you do not have any components in your ForEach loop container before the first component you want to bypass executing you can add an empty Sequence container, connect that to your first component and set the constraint on that connection.
There are no special teachers of virtue, because virtue is taught by the whole community.
--Plato