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XSDError: Loaded schema file is invalid

You may encountering the following error (or similar) on opening .gml, .cnd, std or .prj files in the Data Explorer or file conversion tools (e.g. OGSFileConverter):

Error message:

Error XSDError in http://www.opengeosys.org/images/xsd/OpenGeoSysCND.xsd, at line 1, column 1: Start tag expected.
Error XSDError in file:///../bc/well.cnd, at line 5, column 195: Loaded schema file is invalid.
XMLInterface::isValid() - XML File is invalid (in reference to schema ./OpenGeoSysCND.xsd).
Error XSDError in http://www.opengeosys.org/images/xsd/OpenGeoSysCND.xsd, at line 1, column 1: Start tag expected.

Solution:

Open the affected file (e.g. well.cnd in this case) in a text editor and remove the following parameter of the XML root element (the first element in < >-brackets in the element, e.g. <OpenGeoSysCND>):

xsi:noNamespaceSchemaLocation="http://www.opengeosys.org/images/xsd/OpenGeoSysXXX.xsd"

where XXX can be CND, GLI, PRJ or STN depending on the file type.

Now the save the modified file and try to load it again.