Today browsed the XML files, and I decided to edit it, so that the mission opened only when the player reach the appropriate goals. This subject touched upon in the post: http://slitherine.com/forum/viewtopic.php?f=266&t=45938
I know unlocking missions no one took for warmth, but for me the game is now much historically
(Well only except the Gemini missions took place in 1998 
)If anyone wants to see what it looks like, please extract the XML files to Your_game_ directory\SPM-Windows_Data\Scripts\Data Scripts\General Container and replace the files. Maybe developers will use them in the future.
The modified files are: Programs.xml, ProgramCategories.xml, MsnCnfg27-00.xml, MsnCnfg28-00.xml
Before replacing make a backup of original files!
Important (Files are from version 0.7.5+ and I do not know that it will work with other versions of the game)
