@@ -77,6 +77,7 @@ func TestParseMountSpec(t *testing.T) {

 			`lpt7:d:`:                          `cannot be a reserved word for Windows filenames`,

 			`lpt8:d:`:                          `cannot be a reserved word for Windows filenames`,

 			`lpt9:d:`:                          `cannot be a reserved word for Windows filenames`,

+			`c:\windows\system32\ntdll.dll`:    `Only directories can be mapped on this platform`,

 		}

 	} else {

@@ -177,6 +177,24 @@ func ParseMountSpec(spec string, volumeDriver string) (*MountPoint, error) {

 		}

 	}

+	// Fix #26329. If the destination appears to be a file, and the source is null,

+	// it may be because we've fallen through the possible naming regex and hit a

+	// situation where the user intention was to map a file into a container through

+	// a local volume, but this is not supported by the platform.

+	if len(mp.Source) == 0 && len(mp.Destination) > 0 {

+		var fi os.FileInfo

+		var err error

+		if fi, err = os.Stat(mp.Destination); err == nil {

+			validName, err := IsVolumeNameValid(mp.Destination)

+			if err != nil {

+				return nil, err

+			}

+			if !validName && !fi.IsDir() {

+				return nil, fmt.Errorf("file '%s' cannot be mapped. Only directories can be mapped on this platform", mp.Destination)

+			}

+		}

+	}

+

 	logrus.Debugf("MP: Source '%s', Dest '%s', RW %t, Name '%s', Driver '%s'", mp.Source, mp.Destination, mp.RW, mp.Name, mp.Driver)

 	return mp, nil

 }