Have you noticed that OFP: Resistance's new SP missions are located in their own subdirectory?
Take a hint! OFP: Resistance introduces support for subdirectories in its MISSIONS subdirectory. So, if you've got a large SP mission collection, you can now organize them in separate folders, if you wish.
CAUTION: It is recommended that you do not place the original OFP SP mission files in a new subfolder, as old OFP's install procedures placed them where they should remain. For your convenience, here's a full list of all of old OFP's SP mission files: