If important, the data needs to be typed by hand into the receiving genealogy program. Examine the new data extensively. Use the commands of the genealogy program to move about the data and check the data to see if it meets your standards of integrity. If so, then go to the next step. Use the commands built into your genealogy program to merge the two databases together.
Many people never add anyone else's data to their primary database.
They may examine this newly-received data closely but might still not accept it. You don't want to type your data in a second time. Some modern genealogy programs will recognize the format of the file being imported and will switch accordingly. He is also a frequent author and lecturer on topics concerning the use of computers in genealogy.