SystemOpen
Wolfram KernelFrontend symbol
SystemOpen[path_String | _File | _URL, opts___]opens a file, url or a folder specified by the first argument. It uses OS API.
It uses absolute path. To open a file in your notebook directory use the pattern
SystemOpen[FileNameJoin[{NotebookDirectory[], "yourFile"}]]Options
"Window"
By the default is uses CurrentWindow from the current context. If the context is not available, you have to specify a window object explicitly.
Works only for Desktop App