I have created a package in VS2017 but then had to change it to use TargetServerVersion 2014.
When in 2017 my File System Task works. When changing to 2014 I get "Could not find a part of the path." error when running the package.
I am using a variable to specify the path and if I copy the variable contents that points to a file I am able to open the file it points to when putting it into Run (Txt file).
So... works in 2017 mode but not TargetServerVersion 2014.
I also retried deleting the File System Task and recreating it but the problem stays.