This is a syntax highlighting definition file for the Midnight Commander Editor. It highlights Java .properties files.
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Installation
Place the file properties.syntax into your ~/.mc/syntax directory, and put following lines to the ~/.mc/cedit/Syntax:
file ..\*\\.(properties|config) Java\sFile include /home/yourhome/.mc/syntax/properties.syntax
You can also place it into global /usr/share/mc/syntax directory and /usr/share/mc/syntax/Syntax if you wish.