diff --git a/chunks.go b/chunks.go
index 8152677f7..f6e329b79 100644
--- a/chunks.go
+++ b/chunks.go
@@ -170,6 +170,7 @@ func (w *chunkWriter) finalizeTail() error {
 	if err := tf.Truncate(off); err != nil {
 		return err
 	}
+
 	return tf.Close()
 }
 
@@ -276,7 +277,12 @@ func (w *chunkWriter) seq() int {
 }
 
 func (w *chunkWriter) Close() error {
-	return w.finalizeTail()
+	if err := w.finalizeTail(); err != nil {
+		return err
+	}
+
+	// close dir file (if not windows platform will fail on rename)
+	return w.dirFile.Close()
 }
 
 // ChunkReader provides reading access of serialized time series data.
diff --git a/compact.go b/compact.go
index a70918a28..955ba3caf 100644
--- a/compact.go
+++ b/compact.go
@@ -426,12 +426,22 @@ func (c *LeveledCompactor) write(dest string, meta *BlockMeta, blocks ...BlockRe
 	if err != nil {
 		return errors.Wrap(err, "open temporary block dir")
 	}
-	defer df.Close()
+	defer func() {
+		if df != nil {
+			df.Close()
+		}
+	}()
 
 	if err := fileutil.Fsync(df); err != nil {
 		return errors.Wrap(err, "sync temporary dir file")
 	}
 
+	// close temp dir before rename block dir(for windows platform)
+	if err = df.Close(); err != nil {
+		return errors.Wrap(err, "close temporary dir")
+	}
+	df = nil
+
 	// Block successfully written, make visible and remove old ones.
 	if err := renameFile(tmp, dir); err != nil {
 		return errors.Wrap(err, "rename block dir")
diff --git a/db_windows.go b/db_windows.go
index 700518e7a..444bf4103 100644
--- a/db_windows.go
+++ b/db_windows.go
@@ -21,8 +21,7 @@ import (
 
 func mmap(f *os.File, sz int) ([]byte, error) {
 	low, high := uint32(sz), uint32(sz>>32)
-
-	h, errno := syscall.CreateFileMapping(syscall.Handle(f.Fd()), nil, syscall.PAGE_READONLY, low, high, nil)
+	h, errno := syscall.CreateFileMapping(syscall.Handle(f.Fd()), nil, syscall.PAGE_READONLY, high, low, nil)
 	if h == 0 {
 		return nil, os.NewSyscallError("CreateFileMapping", errno)
 	}
diff --git a/index.go b/index.go
index c0680aa33..f976de695 100644
--- a/index.go
+++ b/index.go
@@ -153,6 +153,8 @@ func newIndexWriter(dir string) (*indexWriter, error) {
 	if err != nil {
 		return nil, err
 	}
+	defer df.Close() // close for flatform windows
+
 	f, err := os.OpenFile(filepath.Join(dir, indexFilename), os.O_CREATE|os.O_WRONLY, 0666)
 	if err != nil {
 		return nil, err
diff --git a/tombstones.go b/tombstones.go
index 19b224634..d43cd0bd0 100644
--- a/tombstones.go
+++ b/tombstones.go
@@ -49,7 +49,11 @@ func writeTombstoneFile(dir string, tr tombstoneReader) error {
 	if err != nil {
 		return err
 	}
-	defer f.Close()
+	defer func() {
+		if f != nil {
+			f.Close()
+		}
+	}()
 
 	buf := encbuf{b: make([]byte, 3*binary.MaxVarintLen64)}
 	buf.reset()
@@ -82,6 +86,10 @@ func writeTombstoneFile(dir string, tr tombstoneReader) error {
 		return err
 	}
 
+	if err = f.Close(); err != nil {
+		return err
+	}
+	f = nil
 	return renameFile(tmp, path)
 }
 
diff --git a/wal.go b/wal.go
index 225851de1..ec3799857 100644
--- a/wal.go
+++ b/wal.go
@@ -384,7 +384,7 @@ func (w *SegmentWAL) Truncate(mint int64, keep func(uint64) bool) error {
 		w.putBuffer(buf)
 
 		if err != nil {
-			return err
+			return errors.Wrap(err, "write to compaction segment")
 		}
 	}
 	if r.Err() != nil {
@@ -401,14 +401,15 @@ func (w *SegmentWAL) Truncate(mint int64, keep func(uint64) bool) error {
 	csf.Sync()
 	csf.Close()
 
+	candidates[0].Close() // need close before remove on platform windows
 	if err := renameFile(csf.Name(), candidates[0].Name()); err != nil {
-		return err
+		return errors.Wrap(err, "rename compaction segment")
 	}
 	for _, f := range candidates[1:] {
+		f.Close() // need close before remove on platform windows
 		if err := os.RemoveAll(f.Name()); err != nil {
 			return errors.Wrap(err, "delete WAL segment file")
 		}
-		f.Close()
 	}
 	if err := w.dirFile.Sync(); err != nil {
 		return err
@@ -522,6 +523,15 @@ func (w *SegmentWAL) openSegmentFile(name string) (*os.File, error) {
 	}
 	metab := make([]byte, 8)
 
+	// If there is an error, we need close f for platform windows before gc.
+	// Otherwise, file op may fail.
+	hasError := true
+	defer func() {
+		if hasError {
+			f.Close()
+		}
+	}()
+
 	if n, err := f.Read(metab); err != nil {
 		return nil, errors.Wrapf(err, "validate meta %q", f.Name())
 	} else if n != 8 {
@@ -534,6 +544,7 @@ func (w *SegmentWAL) openSegmentFile(name string) (*os.File, error) {
 	if metab[4] != WALFormatDefault {
 		return nil, errors.Errorf("unknown WAL segment format %d in %q", metab[4], f.Name())
 	}
+	hasError = false
 	return f, nil
 }
 
@@ -702,7 +713,8 @@ func (w *SegmentWAL) Close() error {
 	if hf := w.head(); hf != nil {
 		return errors.Wrapf(hf.Close(), "closing WAL head %s", hf.Name())
 	}
-	return nil
+
+	return w.dirFile.Close()
 }
 
 const (
diff --git a/wal_test.go b/wal_test.go
index b4fccb981..2e402d19f 100644
--- a/wal_test.go
+++ b/wal_test.go
@@ -271,8 +271,9 @@ func TestWALRestoreCorrupted_invalidSegment(t *testing.T) {
 	Ok(t, err)
 	f, err := wal.createSegmentFile(dir + "/000001")
 	Ok(t, err)
-	_, err = wal.createSegmentFile(dir + "/000002")
+	f2, err := wal.createSegmentFile(dir + "/000002")
 	Ok(t, err)
+	Ok(t, f2.Close())
 
 	// Make header of second segment invalid.
 	_, err = f.WriteAt([]byte{1, 2, 3, 4}, 0)