/usr/share/texmf/tex4ht/xtpipes/xtpipes-default.4xt is in tex4ht-common 20090611-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | <?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE xtpipes PUBLIC "-//GURARI//DTD xtpipes//EN" "xtpipes.dtd" >
<xtpipes />
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