When opening a project file, the message "The model file could not be found" may appear.
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If the project file and the model file exist in different directories, the project file tracks the model file relative to the path, so it may not be found if you move the file.
In that case, make sure to put the project file and the model file in the same directory.
Windows 2000 and earlier operating systems only support this directory. (Relative paths are not allowed)