External Files Problem

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<a href="https://www.vbulletin.com/docs/html/templates_externalfiles" target="_blank">https://www.vbulletin.com/docs/html/..._externalfiles</a>

i'm trying to get an external file to make as a header to work as a plugin but vb 4 is a little different.

in that $includedhtml = implode('', file('path/to/this/file/myfile.html')); is not working for global_start / other global hooks to show on header template this used to work in vB 3.x