Unclear what the right UI would be on Windows, too;
command-line exactly as now might be considered just a
_little_ unfriendly. Or perhaps not.
+ * Disk scan procedure: the FindFirstFile / FindNextFile
+ functions to scan a directory automatically return the file
+ times along with the filenames, so there's no need to stat
+ them later. Would want to fiddle the shape of the
+ abstraction layer to reflect this.
+ Alternatively, a much easier approach would be to write a
Windows version of just the --scan-dump mode, which does a
filesystem scan via the Windows API and generates a valid