Description of "link-tree" from bzrtools is not enough

The description is "link-tree - Hardlink matching files to another tree. [bzrtools]"
I can't understand from this:
1. is it supported on Windows? (is it cross-platform?)
2. if supported, does it use real NTFS hard links? (important)
3. does it work with FAT32? (although not important for me at all)
*** 4. I' m unsure about what it does. Can I use it in my project to have two copies (original copy + hardlinked one) of directory, so some files are the shared and have one (single) history? ***
5. I need possible use cases for this command! I googled it, but found NO usage examples at all.