If you can clarify exactly which file type or software you meant by “fbl map files,” I’d be glad to give you a factual, safe, and legal explanation of how such files are typically handled.
For most users, try the native application export first; if unavailable, use QGIS with an intermediate format or a trusted conversion script. When in doubt about CRS or data fidelity, test on a small subset before converting large datasets. fbl map files download convert