diff --git a/files/file.go b/files/file.go
index ad78ad06..ee9db86b 100644
--- a/files/file.go
+++ b/files/file.go
@@ -188,6 +188,9 @@ func (i *FileInfo) detectType(modify, saveContent, readHeader bool) error {
 			i.Content = string(content)
 		}
 		return nil
+	case strings.HasPrefix(mimetype, "application/vnd.openxmlformats-officedocument"):
+		i.Type = "officedocument"
+		return nil
 	default:
 		i.Type = "blob"
 	}
diff --git a/http/http.go b/http/http.go
index bc798561..082db1d7 100644
--- a/http/http.go
+++ b/http/http.go
@@ -53,6 +53,8 @@ func NewHandler(
 	users.Handle("/{id:[0-9]+}", monkey(userGetHandler, "")).Methods("GET")
 	users.Handle("/{id:[0-9]+}", monkey(userDeleteHandler, "")).Methods("DELETE")
 
+	api.PathPrefix("/onlyoffice").Handler(monkey(onlyofficeCallbackHandler, "/api/onlyoffice/callback")).Methods("POST")
+
 	api.PathPrefix("/resources").Handler(monkey(resourceGetHandler, "/api/resources")).Methods("GET")
 	api.PathPrefix("/resources").Handler(monkey(resourceDeleteHandler(fileCache), "/api/resources")).Methods("DELETE")
 	api.PathPrefix("/resources").Handler(monkey(resourcePostHandler(fileCache), "/api/resources")).Methods("POST")
diff --git a/http/onlyoffice.go b/http/onlyoffice.go
new file mode 100644
index 00000000..c8bc67da
--- /dev/null
+++ b/http/onlyoffice.go
@@ -0,0 +1,65 @@
+package http
+
+import (
+	"io/ioutil"
+	"net/http"
+	"errors"
+	"encoding/json"
+)
+
+type OnlyOfficeCallback struct {
+	ChangesUrl  string              `json:"changesurl,omitempty"`
+	Key         string              `json:"key"`
+	Status      int                 `json:"status"`
+	Url         string              `json:"url,omitempty"`
+	Users       []string            `json:"users,omitempty"`
+	UserData    string              `json:"userdata,omitempty"`
+}
+
+var onlyofficeCallbackHandler = withUser(func(w http.ResponseWriter, r *http.Request, d *data) (int, error) {
+	body, e1 := ioutil.ReadAll(r.Body)
+	if e1 != nil {
+		return http.StatusInternalServerError, e1
+	}
+
+	var data OnlyOfficeCallback
+	err1 := json.Unmarshal(body, &data)
+	if err1 != nil {
+		return http.StatusInternalServerError, err1
+	}
+
+	if (data.Status == 2 || data.Status == 6) {
+		docPath := r.URL.Query().Get("save")
+		if docPath == "" {
+			return http.StatusInternalServerError, errors.New("Unable to get file save path")
+		}
+		
+		if !d.user.Perm.Modify || !d.Check(docPath) {
+			return http.StatusForbidden, nil
+		}
+
+		doc, err2 := http.Get(data.Url)
+		if err2 != nil {
+			return http.StatusInternalServerError, err2
+		}
+		defer doc.Body.Close()
+
+		err := d.RunHook(func() error {
+			_, writeErr := writeFile(d.user.Fs, docPath, doc.Body)
+			if writeErr != nil {
+				return writeErr
+			}
+			return nil
+		}, "save", docPath, "", d.user)
+
+		if err != nil {
+			_ = d.user.Fs.RemoveAll(docPath)
+			return http.StatusInternalServerError, err
+		}
+	}
+
+	resp := map[string]int{
+		"error": 0,
+	}
+	return renderJSON(w, r, resp)
+})