dtexec.exe and DtsDebugHost.exe will live in the DTS\Version\Binn folder where Version - 110 = SQL Server 2012 - 100 = SQL Server 2008 and SQL Server 2008 R2 - 90 = SQL Server 2005
For 64 bit machines, there will be two flavors of the executable. Assuming installation to the default location, you may find them at
32 bit location
- C:\Program Files (x86)\Microsoft SQL Server\90\Tools\Binn
- C:\Program Files (x86)\Microsoft SQL Server\100\Tools\Binn
- C:\Program Files (x86)\Microsoft SQL Server\110\Tools\Binn
64 bit location
- C:\Program Files\Microsoft SQL Server\90\Tools\Binn
- C:\Program Files\Microsoft SQL Server\100\Tools\Binn
- C:\Program Files\Microsoft SQL Server\110\Tools\Binn
For 32 bit machines, please destroy your machines and update to 64 bit architecture. That said, your file locations will be the same as the 64 bit locations above.