1. Data
The virtual column will just be a place holder, its name and contents will not show, so just make it a text column with a formula of "" and perhaps name it "specSheet_Icon".
The column which actually contains the file will have its name shown as "specSheet", unless you want to give it a different Display Name.
2. UX
In the table view, specify the column order to put the vc wherever you want it, I would assume to the right of the specSheet column.
3. Behavior
You should see an Action to open the file, this is created automatically because you have a file type column. If you edit that action, in the Appearance section you will find the Attach to Column option. Change that to be the virtual column you created.
The end result in the table view should be a column with the heading of specSheet and showing the file name, then a column next to it which has no heading but shows the file icon.
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