Display hyperlink to another page as a column in the Document Library Web Part
You will need to customize the Web Part located in the: \CMSModules\DocumentLibrary\Controls\DocumentLibrary.xml
where you will add your "Link field", e.g.:
<?xml version="1.0" encoding="utf-8" ?>
<grid>
<columns>
<column source="##ALL##" externalsourcename="DocumentName" sort="DocumentName" caption="$general.documentname$" wrap="false" width="100%" />
<column source="DocumentType" externalsourcename="documenttype" caption="Link" wrap="false" />
<column source="DocumentModifiedWhen" externalsourcename="modifiedwhen" caption="$general.modified$" wrap="false">
<tooltip source="DocumentModifiedWhen" externalsourcename="modifiedwhentooltip" />
</column>
<column source="##ALL##" externalsourcename="status" caption="$general.workflowstep$" wrap="false" />
</columns>
<options>
<key name="ShowSelection" value="false" />
</options>
</grid>
and then add a small modification (anchor = <a> tag) in the code-behind: \CMSModules\DocumentLibrary\Controls\DocumentLibrary.ascx.cs. in the method: gridDocuments_OnExternalDataBound add one more case (e.g.: around the line 1080)
case "documenttype":
return "<a href=\"http://www.kentico.com\">Kentico website</a>";
I've used the DocumentType column just as example, it doesn't influence the content.