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Hello everybody, I am a new user of VirtualBox .
I have a Windows 7 guest OS on a Ubuntu 18 host that I mainly use for Adobe applications, with latest VirtualBox 6. I set up a shared folder using Guest Additions and everything works fine, I can access and modify the files with almost all the Windows programs that I installed. There is only one exception: I cannot modify files in the shared folder with Adobe InDesign. Whenever I try to open an .indd file in the shared folder, I get the message:

The network connection was lost for the file Z:\path\to\file.indd or the file was modified by another process.

And then the program crashes. This does not happen if I copy the file to a local Windows folder (but this is annoying because InDesign projects can be very big and have a lot of links). This also does not happen when using Adobe Illustrator and Photoshop.

I tried disabling UAC and reinstalling Guest Additions, with no success.

Thank you very much to anyone who will help me!

This is quite common. GA shared folders are good for getting files into and out of a VM. They are not good for full duplex I/O from a running guest app. If you want that then you should configure a true network share.

mpack wrote:This is quite common. GA shared folders are good for getting files into and out of a VM. They are not good for full duplex I/O from a running guest app. If you want that then you should configure a true network share.

Hi, thank you very much for your answer.
Ok, yea I suspected that. Could you please point me to a good resource/tutorial on how to do that?

Not really, I never found that it needed much explanation so I never looked for one. You configure a network that your host and VM can both belong to (i.e. bridged or host-only), and you designate a folder on your host as shared (SAMBA protocol on the host since it's a Linux host and Windows guest). After that the plug and play aspects of most modern OS's will make the shared folder visible to your guest OS in a similar way that the GA share was visible, though on a different network branch.

One wrinkle to watch for: modern Windows OS's have SMB1 support disabled by default for security reasons. I assume modern Ubuntu supports SMB2, but I don't know for sure. I'm also not sure at which point this started being a problem, but with Win7 you probably won't have to do anything.