can this be used to apply prettier formatting on xml files with a different file extension

[gedri]

In my project I have some xml files with a custom file extension (namely 'spx').
When I try to set that extension in the fileExtensions property it doesn't work and I get this in the debug output:
[error] No parser could be inferred for file: test.spx

Is there a way to make this work?

Thanks in advance!

[gedri]

Hello again,
I would still love to get this problem resolved.
I realize you are probably no longer maintaining this extension - this is understandable.
I'm sure it's a simple issue I could solve quickly if I had access to the source code - would you consider allowing me to contribute to this extension?

Thanks in advance.
Gil