>I'm pretty sure that there's a limit but I doubt that it's that small. What error do you get? Can you give an example of URL that doesn't work?
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>>I am using shellexecute() to load a URL with the users default browser. However, the parameter which contains the URL will not accept a string longer than 125 chars. What is a better way to load a URL with the users default browser?

There is a limit on QueryString. In some browsers it's 512KB

Still it doesn't explain the error.

Did you try to URLEncode the parameter string ?