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In order to support [[Java (programming language)|Java]] applications, the [[FlexOS]]-based [[IBM 4690 OS]] version 2 introduced its own [[virtual file system]] (VFS) architecture to store long filenames in the FAT file system in a backwards-compatible fashion. If enabled, the virtual filenames (VFN) are available under separate logical drive letters, whereas the real filenames (RFN) remain available under the original drive letters.<ref name="IBM_4690_Programming_Guide" />
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{{Unreferenced section|date=August 2025}}
The FAT file system itself is not designed for supporting [[fork (file system)|alternate data streams]] (ADS), but some operating systems that heavily depend on them have devised various methods for handling them on FAT volumes. Such methods either store the additional information in extra files and directories ([[classic Mac OS]] and [[macOS]]), or give new semantics to previously unused fields of the FAT on-disk data structures ([[OS/2]] and [[Windows NT]]).
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