The dma_oil_workers.rar file you have requested: Addons / Units / DMA Williec Oil Worker - 2.23mb is not available. Perhaps try browsing all files for the game Operation Flashpoint and upload any files you want to share or are missing. This is the only information we could locate:
New oil worker units, to go with the Oil themed DMA-LIBYA map. Are also included in the DMA-LIBYA download.