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[HKEY_LOCAL_MACHINE\SOFTWARE\Classes\eso\shell\Open\Command] @="\"C:\\Programme\\StepOver\\eSignatureOffice\\SOSigOffice.exe\" \"%1\""
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Additional information for Firefox:
As of version 122.0 (currently the most recent version) the Firefox browser has a bug which deletes the colon in the PDF download path, which makes a message appear that the PDF cannot be found.
To fix this problem, replace this colon with "%3A".
So our example URL will look like this:
Additional setting for Chrome:
Open "Preferences" of Chrome, you can find it under %LOCALAPPDATA%\Google\Chrome\User Data\Default\Preferences
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