loading missions into the editor

[Archamedes 10]

I have downloaded some user misions just so i can unpbo them and see how the missions are put together so i can learn myself how to make missions, but i cant seem to open any of the downloaded missions in the editor, which folder do i put them in?

[DTM2801 10]

..\My Documents\ArmA 2\missions

[Archamedes 10]

thank you. i tried putting them in the missions foldier in the root directory