In the menu bar, there is an option "Load" included in the tool. Click on the button and select the STR file that has scanned data of MDF and NDF file.
Yes, the software is capable of recovering data even if the DB is in suspect mode. Even, if the database file is corrupt, the software will recover data from it successfully.
Yes, this tool works on databases of all SQL Server editions. So, if you have database for SQL 2012 edition, the software will work.
No, for recovering data from SQL database file, there is no need of having SQL Server on machine. But for exporting the database, live SQL Server environment is necessary.