Unable to browse my ReadyNAS device using Raidar 6.3.0 with Windows 10

Your v1 NAS only supports SMBv1.  Microsoft has started deprecating SMBv1, due to security issues that were exposed in the WannaCry breakouts last year. 

So the first thing to look at is whether your Windows 10 system has the SMBv1 client installed.  There is some more information here on that: https://support.microsoft.com/en-us/help/4034314/smbv1-is-not-installed-windows-10-and-windows-server-version-1709

Perhaps first look for in the windows event log for the specific log messages are are in the article.  Or you could try opening the Windows Control Panel. Click Programs, and then click Turn Windows features on or off (under the Programs heading). If the check box for SMB 1.0/CIFS File Sharing Support is clear, you can try setting it.

You could alternatively search the windows features for an NFS client.  If that can be installed, you could enable NFS for your shares on the NAS.  That would be more secure than using SMBv1.

If SMBv1 is still enabled on your PC, then post back for some other ideas.