/usr/share/openmsx/systemroms/README is in openmsx-data 0.10.0-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 | This directory is the default file pool for system ROMs. If you put your system
ROMs here, openMSX will find them if they have the right sha1 sum, i.e. if they
are exactly the right ROMs. The file name is irrelevant.
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