MHo: What would be cool: if we could mount a Mk4vfs as a (windows-)drive or at least from within a file manager like total commander, so we would be able to work with the files in such a VFS as with any other files.
LV Have you checked with any of the Tcl file managers to see if they currently support this? If not, see if there is a tcl file manager which is actively being developed and submit that as a feature request.
SEH: On Linux/Unix, you could use the tcl-fuse extension to make a Tcl virtual filesystem visible to the operating system as a whole. On Windows, you could use a utility like NetDrive or FTPDrive to make a Tcl WebDAV server or FTP server appear as a letter drive, and use that server to make available any other Tcl virtual filesystem such as mk4vfs.