The file: /// is for resources on your own machine.
To open files on the server, you will need to link to the URLs on the server. Using:
HttpContext.Current.Request.ResolveUrl(pathOnServer);
Change your code as follows:
<asp:Repeater ID="dokumente" runat="server">
<ItemTemplate>
<tr>
<td><asp:HyperLink ID="HyperLink4" runat="server" Text='<%# Eval("DokuTyp") %>' NavigateUrl='<%# HttpContext.Current.Request.ResolveUrl(Eval("File")) %>'></asp:HyperLink></td>
<td><%# Eval("Description")%></td>
<td><%# Eval("Date") %></td>
<td><%# Eval("File") %></td>
</tr>
</ItemTemplate>
</asp:Repeater>
Where is the server
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