NPP FAW: How to hide files by file extension?
Solution 1:
Unfortunately, if I am not mistaken, there is no way to directly filter by file type. That said, if you configure a normal Workspace with a Project, you can add files and folders manually and remove any unwanted files as needed.
Notes
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You can't filter additions in bulk but you can select multiple files to add manually (or whole directories).
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Once added, files normally can only be removed on an individual basis (no bulk selections). However, a group of files can be removed en masse if they are removed as part of a folder.