Cfg File Extension
Cfg is an extension of Configuration setting files. These formats can be used by Note pad or Wordpad applications.
Many softwares keep settings that made in the file with .cfg extension. A standard cfg file can be opened by Note pad application. However, you should be careful when you try to change something. Any wrong adjustment can cause a system crash.
Also you may try Wordpad to open cfg files.
What needed to Open Cfg file extensions.
Note pad , Wordpad or free alternatives
Links about Cfg file extension