Why difference in DirectShowSource 2.58 and 2.6 for webm

[Starduster]

I have a webm file that works fine on a server with 2.58 but errors out on Windows 10 with 2.6 with "The format is not supported". I even uninstalled 2.6 and installed 2.58 on the Win10 box and still got the error. I did use FFAudioSource and FFVideoSource on the Win10 box and that did work. I'd prefer to use DirectShowSource for legacy reasons if possible.

MediaInfo:
Complete name : C:\415_0_0_7.webm
Format : WebM
Format version : Version 4
File size : 2.17 MiB
Duration : 6 s 419 ms
Overall bit rate : 2 830 kb/s
Writing application : Lavf58.26.100
Writing library : Lavf58.26.100

Video
ID : 1
Format : VP9
Codec ID : V_VP9
Duration : 6 s 367 ms
Width : 1 280 pixels
Height : 720 pixels
Display aspect ratio : 16:9
Frame rate mode : Variable
Language : English
Default : Yes
Forced : No
Color range : Limited
ALPHA_MODE : 1

Audio
ID : 2
Format : Opus
Codec ID : A_OPUS
Duration : 6 s 239 ms
Channel(s) : 1 channel
Channel layout : C
Sampling rate : 48.0 kHz
Bit depth : 32 bits
Compression mode : Lossy
Language : English
Default : Yes
Forced : No