Add the \?\ prefix to all paths on Windows

src/duplicacy_utils_windows.go

@@ -7,8 +7,10 @@ package duplicacy
 import (
 	"fmt"
 	"os"
+	"strings"
 	"syscall"
 	"unsafe"
+	"path/filepath"
 )
 
 type symbolicLinkReparseBuffer struct {
@@ -114,3 +116,13 @@ func (entry *Entry) ReadAttributes(top string) {
 func (entry *Entry) SetAttributesToFile(fullPath string) {
 
 }
+
+func joinPath(components ...string) string {
+
+	combinedPath := `\\?\` + filepath.Join(components...)
+	// If the path is on a samba drive we must use the UNC format
+	if strings.HasPrefix(combinedPath, `\\?\\\`) {
+		combinedPath = `\\?\UNC\` + combinedPath[6:]
+	}
+	return combinedPath
+}