VB2013, Generating unsigned manifests by excluding a file from the hash...

The programs I develop are only used were I work and are installed by me.  I want to avoid the whole Certificate/signing hassle and one of the advantages of VS2013 is that you are suppose to be able to do that.  (According to )

The last paragraph of instructions say:

To generate unsigned manifests and exclude one or more files from the generated hash
1.On the Signing page, clear the Sign the ClickOnce manifests check box.

2.Open the Application Files dialog box and set the Hash to Exclude for the files that you want to exclude from the generated hash.

3.Publish the application.

My questions are:

What file is safe to exclude?

I thought I saw a "Hash" column, but I must have imagined it because the only column I have now on the projects "Application Files" screen are Publish Status and Download Group.  (Publish Status is the only one with an "Exclude" choice.)

Can I just create an empty text file, include it in my project, and then Exclude it on the Application Files list (even though Download Group says it is Required) - would that do the trick?

Thanks