That sounds like a problem with your app, not theirs. There's no reason why a compliant SVG with only 20 lines shouldn't be easily compatible with any vector drawing program.
Inkscape which uses SVG as it's "internal" format often chokes on seemingly "simple" svg files (which when you look into it have thousands of points on a simple curve).
Often these have been generated by another SVG tool, support another tools idiocy for whatever marginal gain he might make is maybe why he doesn't want to do it.
Often these have been generated by another SVG tool, support another tools idiocy for whatever marginal gain he might make is maybe why he doesn't want to do it.