It needs to "talk" to your OS to handle file associations.
Furthermore, users should always be wary of third-party sites offering pre-packaged portable versions. These can often contain malware or outdated versions of the software. For the safest experience, many users turn to "ThinApp" or "PortableApps" creators to virtualize their own officially licensed version of the software for personal use. Conclusion dwg trueview portable
Yes, but only if you build it yourself and manage expectations. It needs to "talk" to your OS to handle file associations