For info, I just discovered that this tool https://www.svgminify.com/ has a reasonably robust svg reader which removes a lot of cruft or nonsense. I've just tried this on a similar file and it works.

Will

Thank you, that's super helpful

I have a file that I created in inkscape (attached). I haven't edited it in any other program, but when I try and open it now, I get a (rather uninformative) error "Inkscape encountered an internal error and will close now". error.png I've tried looking at them in a text editor, but (to my...