--- /usr/bin/xdg-open	2018-05-11 22:39:34.618755354 +0300
+++ xdg-open	2018-05-23 23:58:58.184279559 +0300
@@ -939,7 +939,7 @@
 {
 
     # pcmanfm only knows how to handle file:// urls and filepaths, it seems.
-    if pcmanfm --help >/dev/null 2>&1 -a is_file_url_or_path "$1"; then
+    if ([ -x /usr/bin/pcmanfm ]  && is_file_url_or_path "$1" ); then
         local file="$(file_url_to_path "$1")"
 
         # handle relative paths