Export the Windows image
Once you've created and configured a Parallels Desktop Windows image, you need to export it as an archive and then make the archive available for download to Chrome OS users.  
To export a Windows image, in the Chrome browser press Ctrl+Alt+T to open the crosh terminal. In the terminal, type the following command: 
vmc export -d PvmDefault <ArchiveName.zip> 
where: 
Example: 
vmc export -d PvmDefault Windows.zip 
When you execute the command above, the following will happen: 
- The image is exported to the Downloads folder in Chrome OS. The image file is a ZIP archive with the ".pvm" bundle inside (.pvm is the extension that Parallels Desktop uses for its virtual machine bundles). 
 - The SHA-256 checksum file is also created in the same folder and is named PvmDefault.zip.sha256.txt. It is a text file containing the SHA256 hash string.
  
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