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A portable copy unzipped into a read-only folder such as Program Files kept pointing settings and recovery at a DesignCraftData it could not write, so both were lost without a word. The data folder is now probed (created, then a file written and removed) and, when that fails, the platform folders are used as if there were no portable.txt; the log and the status bar say which folder could not be written. DESIGNCRAFT_CONFIG_DIR still wins. Adds a_portable_install_that_cannot_write_its_data_uses_the_platform_paths.