$ pcmanfm .

** (pcmanfm:12864): WARNING **: terminal x-terminal-emulator isn't known, consider report it to LibFM developers

** (pcmanfm:12864): WARNING **: modules directory is not accessible

** (pcmanfm:12864): WARNING **: modules directory is not accessible
Not a native file, thumbnailing will likely fail
Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
Error: Could not open input file: /home/USER/tmp/1/remote.mkv
Not a native file, thumbnailing will likely fail
Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
Using network protocols without global network initialization. Please use avformat_network_init(), this will become mandatory later.
Error: Could not open input file: /home/USER/tmp/1/test.mkv
Not a native file, thumbnailing will likely fail
Error: Could not open input file: /home/USER/tmp/1/test2.mkv
Not a native file, thumbnailing will likely fail
Error: Could not open input file: /home/USER/tmp/1/test3.mkv