- moving data over the network always causes files' contents to be copied, but in some cases it could be done without copying (ie. when browsing local computer through the Network Neighbourhood).
- intercepting drag&drop operations by program (by left mouse button) doesn't work on older systems (especially Windows 98 and 95).
- drawing icons in explorer context menus doesn't work on older Windows versions
- when copying many small files the program is rather slow