Function With Start you can execute files, e.g. .exe, .bat, .doc or .pdf files:

Start "File name"  

This opens the same application that is launched when double-clicking the file in Windows Explorer.

Alternatively, websites can be opened in the default browser.

Start "URL of the page"

In addition, websites can also be accessed directly via their IP address.

 Start "IP address of the page"

The "mailto:" protocol can be used to start a local E-Mail program:

 Start "mailto:mary@company.com?subject=Sales Meeting 2026&body=Our annual sales meeting 2026 will take place in Rome, Italy, Hotel Residenza Piranesi"

Format Start "File name"

The specified file is searched in the current script directory if no absolute path is provided. Files from the SAP MIME Repository are first copied to a local file.

Start "https://www.google.com"

The website is opened in the default browser.

Start "https://127.0.0.1:443" Standard loopback address

Start "https://192.168.0.###:443" Typical IP address for local networks

Start "https://IP:PORT"

If no DNS server is available or no IP address is assigned to the domain, internal websites can also be accessed directly via their IP address (e.g. 127.0.0.1 as the standard loopback address or localhost if the web server is running locally on the machine).

Start "http://[2001:67c:1898:11::46]/"

IPv6 addresses can also be used, but may not always work, as they are often blocked by firewall rules on the HTTP/HTTPS server (e.g. ports 80/443).

Additional Options
parameters= String with parameters
directory= Default directory
operation= Operation to be performed. Default operation is "Open". The other operations depend on the document type. Often the operations  "Edit" and "Print" are defined as well. 
prefix= The given string is put before the file name when executing the Windows start command.
suffix= The given string is put after the file name when executing the Windows start command.
returnId= If a new process is started by Start, a unique process id is returned. It can be used in to terminate the process.

Please note: When you use Start to call up Excel, an already existing Excel process will be used in the standard Excel configuration. In this case no process id will be returned. You may use the Excel start option /x to force Excel to start a new process in any case. Example:
Start "&V[excelpath]" parameters="/e /r /x C:\temp\myfile.csv" returnId="proc"

Similarly, when using Start to open an image file and thus calling Photos.exe, the first call to that process leaves it active, subsequent calls do instead start self-terminating processes, to which GuiXT does not connect.
Tips & Tricks
Components GuiXT + InputAssistant