Relative file URIs are incorrect

File URIs should take one of the following formats:

* `file:relative/path/to/file` (probably what we want)
* `file:/absolute/path/to/file` (likely not what we want)
* `file:///absolute/path/to/file` (likely not what we want)
* `file://SERVER_NAME/absolute/path/to/file` (definitely not what we want)

Currently, relative file URIs in the manifests are incorrectly encoded with the final form and need to be fixed.

Search the manifest handling for the entry point that encodes relative file URIs, then compare its output with the URI formats listed in the issue. The work is done when relative manifest paths use the file:relative/path/to/file form rather than the file://SERVER_NAME form, with relevant behavior verified by the project's tests.

Written by the indexing model from the issue text.