Here are the steps.
Step 1: Select the Application Folder and add File
Step 2: Choose the file
Step 3: The external exe is being added successfully. The only caveat to this is, if the exe is not in TFS (Source control), when other team members trying to open this project. It will fail to load. So the external exe needs to be provisioned on some shared location (if this is not in TFS)
Step 1: Add/check-in the custom/new build template into TFS under “BuildProcessTemplates” folder on the Team Project.
Step 2: Create New build definition or Edit the existing build definition
Step 3: Click on the Process node and expend the “Build Process Template”
Step 4: Click the new button
Step 5: Select the Custom/New Build template
Now the new build template would be available for this Team Project
