The whole thing is in C++, but more in C-with-classes style. Very little of meta programming outside of STL, flat class hierarchy, etc.

In terms of dependencies - just the Windows API and a bit of Native API, if available. No WMI, very little of COM (for shell and shadow copying). It does however use quite a few exotics from the Windows API, e.g. SetFileIoOverlappedRange, SetFileCompletionNotificationModes, etc.