EDIT 2007/07/27 Reworked the tool (v1.1) to work with all official Civilization 4 expansions (Warlords, Beyond the Sword) and mods. You should still note that the tool defaults to the original Civilization IV Civ4TechInfos.xml file when launched from the main program folder. Navigate manually to the xml file you wish to edit. ------------- I just finished a small editor to quickly alter technology costs for each era. I made it mainly for my own modding needs, but thought to release it for other people to use as well. I know it's a real chore to alter all 80+ technologies and their costs to mod research speeds. With this tool it's a real breeze. Unzip the executable file into the main Civilization 4 folder (for the editor to find the correct path itself) and run it. I think these screenshots speak for themselves: File open dialog: Editor main screen: It edits the Assets\XML\Technologies\CIV4TechInfos.xml file and re-writes a new one based on the given tech multipliers for each era. Example: The original technology cost for Mysticism (Ancient Era) is 50. If the given multiplier for Ancient Era is 2.0, the editor would double the technology cost to 100, making Mysticism (and all other Ancient technologies) take twice as long to research. Although the editor makes backup copies of its own, it's always advisable to backup the original CIV4TechInfos.xml before editing. In any case, I'm not responsible if the editor screws up your Civ4 installation I hope it has use for some of you. Have fun.