This option has limited value.
IDA produces executable files only for:
- MS DOS .exe
- MS DOS .com
- MS DOS .drv
- MS DOS .sys
- general binary
- Intel Hex Object Format
- MOS Technology Hex Object Format
-- IDA Help file
While this is the most promising menu option, it unfortunately is also the most crippled. In a nutshell, it doesn't work for most file types...
-- The IDA Pro Book, Chapter 14
That chapter goes into more detail why this option is not very useful. For starters, IDA doesn't parse and save contents of sections such as
.rsrc, and doesn't have a way to rebuild import/export tables back into their original format.
Read this book. Not just for this question, it's a good and useful read.