diff --git a/internal/bootstrap/data/setting.go b/internal/bootstrap/data/setting.go
index 6235a26a217..9982dc50feb 100644
--- a/internal/bootstrap/data/setting.go
+++ b/internal/bootstrap/data/setting.go
@@ -82,16 +82,25 @@ func initialSettings() {
 		{Key: conf.AudioTypes, Value: "mp3,flac,ogg,m4a,wav,opus", Type: conf.TypeText, Group: model.PREVIEW, Flag: model.PRIVATE},
 		{Key: conf.VideoTypes, Value: "mp4,mkv,avi,mov,rmvb,webm,flv", Type: conf.TypeText, Group: model.PREVIEW, Flag: model.PRIVATE},
 		{Key: conf.ImageTypes, Value: "jpg,tiff,jpeg,png,gif,bmp,svg,ico,swf,webp", Type: conf.TypeText, Group: model.PREVIEW, Flag: model.PRIVATE},
-		{Key: conf.OfficeTypes, Value: "doc,docx,xls,xlsx,ppt,pptx", Type: conf.TypeText, Group: model.PREVIEW, Flag: model.PRIVATE},
+		//{Key: conf.OfficeTypes, Value: "doc,docx,xls,xlsx,ppt,pptx", Type: conf.TypeText, Group: model.PREVIEW, Flag: model.PRIVATE},
 		{Key: conf.ProxyTypes, Value: "m3u8", Type: conf.TypeText, Group: model.PREVIEW, Flag: model.PRIVATE},
 		{Key: "external_previews", Value: `{}`, Type: conf.TypeText, Group: model.PREVIEW},
-		{Key: conf.OfficeViewers, Value: `{
-	"Microsoft":"https://view.officeapps.live.com/op/view.aspx?src=$url",
-	"Google":"https://docs.google.com/gview?url=$url&embedded=true",
-}`, Type: conf.TypeText, Group: model.PREVIEW},
-		{Key: conf.PdfViewers, Value: `{
-	"pdf.js":"https://alist-org.github.io/pdf.js/web/viewer.html?file=$url"
+		{Key: "iframe_previews", Value: `{
+	"doc,docx,xls,xlsx,ppt,pptx": {
+		"Microsoft":"https://view.officeapps.live.com/op/view.aspx?src=$url",
+		"Google":"https://docs.google.com/gview?url=$url&embedded=true"
+	},
+	"pdf": {
+		"PDF.js":"https://alist-org.github.io/pdf.js/web/viewer.html?file=$url"
+	}
 }`, Type: conf.TypeText, Group: model.PREVIEW},
+		//		{Key: conf.OfficeViewers, Value: `{
+		//	"Microsoft":"https://view.officeapps.live.com/op/view.aspx?src=$url",
+		//	"Google":"https://docs.google.com/gview?url=$url&embedded=true",
+		//}`, Type: conf.TypeText, Group: model.PREVIEW},
+		//		{Key: conf.PdfViewers, Value: `{
+		//	"pdf.js":"https://alist-org.github.io/pdf.js/web/viewer.html?file=$url"
+		//}`, Type: conf.TypeText, Group: model.PREVIEW},
 		{Key: conf.AudioAutoplay, Value: "true", Type: conf.TypeBool, Group: model.PREVIEW},
 		{Key: conf.VideoAutoplay, Value: "true", Type: conf.TypeBool, Group: model.PREVIEW},
 		// global settings
diff --git a/internal/conf/const.go b/internal/conf/const.go
index 1e1b3aa7898..fe66388c46f 100644
--- a/internal/conf/const.go
+++ b/internal/conf/const.go
@@ -21,11 +21,11 @@ const (
 	MainColor = "main_color"
 
 	// preview
-	TextTypes     = "text_types"
-	AudioTypes    = "audio_types"
-	VideoTypes    = "video_types"
-	ImageTypes    = "image_types"
-	OfficeTypes   = "office_types"
+	TextTypes  = "text_types"
+	AudioTypes = "audio_types"
+	VideoTypes = "video_types"
+	ImageTypes = "image_types"
+	//OfficeTypes   = "office_types"
 	ProxyTypes    = "proxy_types"
 	OfficeViewers = "office_viewers"
 	PdfViewers    = "pdf_viewers"
@@ -51,7 +51,7 @@ const (
 const (
 	UNKNOWN = iota
 	FOLDER
-	OFFICE
+	//OFFICE
 	VIDEO
 	AUDIO
 	TEXT
diff --git a/internal/db/settinghooks.go b/internal/db/settinghooks.go
index 6d51c6e855b..a49019ea267 100644
--- a/internal/db/settinghooks.go
+++ b/internal/db/settinghooks.go
@@ -38,12 +38,12 @@ var SettingItemHooks = map[string]SettingItemHook{
 			return nil
 		},
 	},
-	conf.OfficeTypes: {
-		Hook: func(item *model.SettingItem) error {
-			conf.TypesMap[conf.OfficeTypes] = strings.Split(item.Value, ",")
-			return nil
-		},
-	},
+	//conf.OfficeTypes: {
+	//	Hook: func(item *model.SettingItem) error {
+	//		conf.TypesMap[conf.OfficeTypes] = strings.Split(item.Value, ",")
+	//		return nil
+	//	},
+	//},
 	conf.ProxyTypes: {
 		func(item *model.SettingItem) error {
 			conf.TypesMap[conf.ProxyTypes] = strings.Split(item.Value, ",")
diff --git a/pkg/utils/file.go b/pkg/utils/file.go
index 867ed4c8661..d053173e031 100644
--- a/pkg/utils/file.go
+++ b/pkg/utils/file.go
@@ -53,9 +53,9 @@ func CreateTempFile(r io.ReadCloser) (*os.File, error) {
 // GetFileType get file type
 func GetFileType(filename string) int {
 	ext := Ext(filename)
-	if SliceContains(conf.TypesMap[conf.OfficeTypes], ext) {
-		return conf.OFFICE
-	}
+	//if SliceContains(conf.TypesMap[conf.OfficeTypes], ext) {
+	//	return conf.OFFICE
+	//}
 	if SliceContains(conf.TypesMap[conf.AudioTypes], ext) {
 		return conf.AUDIO
 	}