diff --git a/cbconvert_func.go b/cbconvert_func.go
index e2b412a..f8676c3 100644
--- a/cbconvert_func.go
+++ b/cbconvert_func.go
@@ -102,7 +102,7 @@ func isArchive(f string) bool {
 
 // isDocument checks if file is document.
 func isDocument(f string) bool {
-	var types = []string{".pdf", ".xps", ".epub", ".mobi"}
+	var types = []string{".pdf", ".xps", ".epub", ".mobi", ".docx", ".pptx"}
 	for _, t := range types {
 		if strings.ToLower(filepath.Ext(f)) == t {
 			return true
diff --git a/cmd/cbconvert-gui/main_filedlg.go b/cmd/cbconvert-gui/main_filedlg.go
index 064b007..5961d98 100644
--- a/cmd/cbconvert-gui/main_filedlg.go
+++ b/cmd/cbconvert-gui/main_filedlg.go
@@ -24,7 +24,7 @@ func fileDlg(title string, multiple, directory bool) ([]string, error) {
 		dlg.SetAttributes(map[string]string{
 			"DIALOGTYPE":    "OPEN",
 			"MULTIPLEFILES": mf,
-			"EXTFILTER":     "Comic Files|*.rar;*.zip;*.7z;*.tar;*.cbr;*.cbz;*.cb7;*.cbt;*.pdf;*.epub;*.mobi;*.xps|",
+			"EXTFILTER":     "Comic Files|*.rar;*.zip;*.7z;*.tar;*.cbr;*.cbz;*.cb7;*.cbt;*.pdf;*.epub;*.mobi;*.docx;*.pptx|",
 			"FILTER":        "*.cb*", // for Motif
 			"TITLE":         title,
 		})
diff --git a/cmd/cbconvert-gui/main_filedlg_portal.go b/cmd/cbconvert-gui/main_filedlg_portal.go
index 2dea3b3..3a5c301 100644
--- a/cmd/cbconvert-gui/main_filedlg_portal.go
+++ b/cmd/cbconvert-gui/main_filedlg_portal.go
@@ -57,7 +57,8 @@ func fileDlg(title string, multiple, directory bool) ([]string, error) {
 				Item{0, "*.pdf"},
 				Item{0, "*.epub"},
 				Item{0, "*.mobi"},
-				Item{0, "*.xps"},
+				Item{0, "*.docx"},
+				Item{0, "*.pptx"},
 			},
 		},
 	}