Returns file name with extension added
| #include "String and File String.au3" _FileAddExtension( $sFile, $sExtension ) |
| $sFile | File name |
| $sExtension | Extension to add |
| string value | File name with extension |
_FileExtension, _FileSetExtension
_FileAddExtension( "c:\documents\my.book", "docx" ) ; "c:\documents\my.book.docx"