Builder opens a directory listing pane for files it thinks are of uneditable format
Currently, when trying to open a file that Builder thinks is a format it can't open itself, a directory listing pane is opened instead, showing that file's containing folder.
This doesn't like it would be an expected behaviour in this case, and additionally doesn't seem to be useful. For instance, there is no context menu in this view for "open with", unlike in e.g. the main Builder file tree.
Instead, it would seem to make more sense for Builder to show something like an "open with" dialogue window ("This doesn't seem to be a format Builder can edit").
Additionally, at least until Builder can reliably determine that it definitely can't handle a file itself (see e.g. #1204 (closed)), a "Try to open with Builder anyway" option would be useful, at which point Builder could try to open the file itself, treating it as text.