Document link created in Assign Task to open in browser

Hi

One thing my testers have picked up is when they are assigned an approval task with a document link.  They click on the link and a local version is downloaded. Users are generally running a version of Office 2010  but this can occur with new versions. 

Hence, I want guarantee that documents always open in the browser. 

Now, in the Document library you can set this explicitly but I still get the issue.

Here is a useful link

https://support.office.com/en-gb/article/Work-seamlessly-between-Office-Online-and-Office-desktop-applications-2d43ec7b-d173-4c06-91d7-7c5425990093?ui=en-US&rs=en-GB&ad=GB&fromAR=1

One thing I wanted to try is to hand craft a link you seen in the preview dialog box  in my Assign Task

https://tenant.sharepoint.com/team/Document%20Library/My%20Document?d=w[UNIQUE ID]

now the issue is the unique ID is not available in Nintex .

So how do I get around this?