The input path must be absolute, but normalize-path can't be used, because
that returns UNC path, and SHFileOperation fails on any path prefixed with
"\\?", see https://docs.microsoft.com/en-us/windows/win32/api/shellapi/ns-shellapi-shfileopstructa
Use absolute-path instead. The mixture of slashes and backslashes in the
path is tolerated, at least on Windows 10.
Add a simple unit-test.
Fix the incorrect field alignment. SHFileOperationW crashed with a memory
protection error while trying to dereference only part of the string
pointer.
allocate 32k on the local alloc stack (which causes a 'double fault.')
Second, if the volume doesnt look up to a real path, don't make a dummy
object for that. volume
Use alien>native-string and native-string>alien wherever possible instead of
utf16n for Windows.