Yes, with a text editor (Notepad, VS Code), but the content will be mostly binary or structured JSON/metadata – not human-readable for most users.
The .cache file often stores chunks of the installer along with hash values. After the download reaches 100%, the Lumion installer checks these hashes to ensure the file wasn’t corrupted during transit. Only then does it rename or extract the final .exe or .msi installer. Lumion-2024-4-2-Download.cache