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!