Some OWSSVR Parameters are Case-Sensitive

Experimenting with some owssvr URL protocol calls today, and kept getting error pages back when trying to retrieve data from a particular view by specifying a "View" parameter in the querystring

e.g. http://[site url]/_vti_bin/owssvr.dll?CS=109&List={list Guid}&View={View Guid}

Tried swapping various list ids, and removing the view id parameter. Well, it turns out that the View ID is CASE-SENSITIVE, yet the List ID value is not case-sensitive. Cunning way to throw me off the scent, there!