Nice idea but doesnt work properly

Bought this app and I totally want my money back. Im a land surveyor and work in .dwg and .dxf drawings. I am not able to open drawings emailed in those formats and it freezes up my iPad when I try.

When my iPad doesnt freeze up my email screen is filled with weird characters at which point I have to turn my iPad off and then back on.

I would love if this app does what its supposed to, if not I want my money back.

Frustrated_cajah about CARTOMAP CAD