@version is only required for the package files (files describing a package to reapack-index using metadata). If these .txt files are not packages themselves, but are instead part of some other package, they don't need anything (reapack-index will give a warning unless they have @noindex, but will ultimately ignore them nevertheless).
Yes, you can manually edit the .xml file. As for localhost: yes, and file:// URIs are also supported (on the ReaPack side).
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