When you genuinely don't know the source:
You might be tempted to Google "SOR file viewer" and download the first free tool. Many generic "file viewer" websites are ad traps or malware vectors. sor file viewer
Opening a SOR file requires specialized software to render the complex data into a readable graph. Below are the leading tools categorized by platform: Desktop Viewers (Windows/Mac) When you genuinely don't know the source: You