.MIG File

The mig file extension is related to Windows Easy Transfer a program for easy transfer of personal files, e-mail, data, files, media, and settings between computers. 

The mig file contains migration data. Usually found as savedata.mig.

Files with mig file extension can be mostly found as data saved by the Windows Easy Transfer utility.

How to open:

The mig files are used for internal purposes of Windows Easy Transfer program.

How to convert:

Probably cannot be converted to anything else.