FileMaker files created by FileMaker versions 7 thru 11 produce files with the .fp7 file extension and the same file format. FileMaker versions 12 and 13 produce files with the .fmp12 extension and a new/different file format. The file formats are not compatible. FileMaker 11 cannot open .fmp12 files. Filemaker 12 and 13 can only convert .fp7 files producing new files with the .fmp12 extension and format.
Thus you cannot host .fp7 files and connect to them from Filemaker 13.