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When I try to compile some examples and my own programs, I usually get an answer from Visual Prolog that it is impossible to compile, because a file or a disk is read-only.

There can be several reasons of the problem:

  1. You load an example code directly from the Visual Prolog CD. In this case, the VDE, by default, will try to save changes and write generated files to your CD.
  2. Some source files of an example  (for instance, a .VPR file), or the whole Visual Prolog directory, on your HDD  have the read-only attribute.
    Note that some copy utilities can keep read-only file attribute, when you directly copy files to HDD from the Visual Prolog CD ..\RUN subdirectory.