JavaTest Agent's map file syntax does not support any kind of escaping, and treats any space (' '), tab ('\t') or line feed ('\n') as value delimiter. Also, any values after the second white space character are simply ignored.
For example, the following map file entry
    PREFIX WITH SPACES WHAT WE INTENT TO REPLACE
is treated as a map from "PREFIX" to "WITH", with the rest of the entry ignored.

That leads to frustrating errors, and makes map files unusable in some cases (especially on Windows).