It's possible. Be very careful, however, if you don’t know what you are doing because AFM manipulation packages allow you to change your data radically. Always keep a backup, DO NOT modify your data and then save over the original file, because you wont be able to get it back!
If you really want to modify the data yourself, the best thing to do is to get a copy of your AFM manufacturers’ software and use that to analyse your data. Only that program is guaranteed to read the data format of your files correctly. Alternatively, there are third party programs you can use to view. It's much safer (and easier!) to get an experienced AFM user to manipulate your data for you.