10 years ago I was prototyping something very similar for Windows. If I recall, CBFS and Dokan were the closest things you had to FUSE on Windows back then. A

10 years ago I was prototyping something very similar for Windows. If I recall, CBFS and Dokan were the closest things you had to FUSE on Windows back then. Alternatively considered emulating a network drive. Like you pointed out, it had to be transparent to your existing software's Open / Save dialogs (although there was some effort to hook the standard ones to give users a place to apply tags when saving). We've been stuck in the same old directory paradigm for a long time. There are some use cases where the traditional hierarchical approach is desirable (e.g. when you need to "visit" a set of files exactly once, like to browse through a folder to clean it up, enumerate for backup, calculate sizes, etc). But it's a constraint when a file belongs in more than one place.