webm video file doesn't work in Windows 10 GStreamer 1.16.2

I've installed both the complete 32 and 64 bit versions of 1.16.2 on Windows 10.

The attached webm video file works fine if we merely double-click it and it plays in the default Windows player.

But in GStreamer it doesn't work at all. The messages are different in 32 & 64 bit so here are both:

C:\Users\Andy Robinson>C:\gstreamer\1.0\x86\bin\gst-launch-1.0.exe filesrc location="C:\Users\Andy Robinson\Documents\Temp0\Hallelujah - Media - hLaurie.webm" ! decodebin ! audioconvert ! autoaudiosink Setting pipeline to PAUSED ... Pipeline is PREROLLING ... WARNING: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0: Delayed linking failed. Additional debug info: ../gst/parse/grammar.y(510): gst_parse_no_more_pads (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0: failed delayed linking some pad of GstDecodeBin named decodebin0 to some pad of GstAudioConvert named audioconvert0

C:\Users\Andy Robinson> C:\Users\Andy Robinson>C:\gstreamer\1.0\x86_64\bin\gst-launch-1.0.exe filesrc location="C:\Users\Andy Robinson\Documents\Temp0\Hallelujah - Media - hLaurie.webm" ! decodebin ! audioconvert ! autoaudiosink WARNING: no real random source present! Setting pipeline to PAUSED ... Pipeline is PREROLLING ... WARNING: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0: Delayed linking failed. Additional debug info: ../gst/parse/grammar.y(510): gst_parse_no_more_pads (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0: failed delayed linking some pad of GstDecodeBin named decodebin0 to some pad of GstAudioConvert named audioconvert0 ERROR: from element /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstMatroskaDemux:matroskademux0: Internal data stream error. Additional debug info: ../gst/matroska/matroska-demux.c(5715): gst_matroska_demux_loop (): /GstPipeline:pipeline0/GstDecodeBin:decodebin0/GstMatroskaDemux:matroskademux0: streaming stopped, reason not-linked (-1) ERROR: pipeline doesn't want to preroll. Setting pipeline to NULL ... Freeing pipeline ...Hallelujah_-Media-_hLaurie