FTM 11 created a family or file ending in .FTW.
This can be read by the current FTM version FTM 2011 without any retyping.
FTM 11 also created a file with the ending .FBK. This file is identical with the .FTW file and can be changed by simply renaming.
It is also possibile that you have a file created by the backup process of FTM 11 ending in .FBC. This cannot beopened in FTM 2011, however, if you need to you can download the free FTM 2005 Starter Edition (SE) which can open an .FBC file and convert it to .FTW
Go to the FTM knowledge base at http://ftm.custhelp.com/cgi-bin/ftm.cfg/php/enduser/std_alp....
and in the keyword search look for article 3673
How to import unsupported files in Family Tree Maker 2008-2011?
Family Tree Maker 2008-2011 is not able to support certain file types such as .GED files before version 5.5, .FBC files, FTM files from DOS and AFT files. However, Family Tree Maker 2005 Starter Edition can be used to convert your family tree file to a format that can be read by Family Tree Maker 2008-2011.
To download the Family Tree Maker 2005 Starter Edition click here.
So in terms of your own computer
Install FTM 2011 register it etc
Put a copy of the .FTW file in a convenient folder on your hard drive
FTM 2011 should automatically locate and offer to convert and install but if it doesn't, simply go to Plan>New Tree>import from an existing file and navigate to where you have the .FTW file saved.
FTM 2011 will do the rest