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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Fatal error C1023
 
     cannot open source file 'filename'
 
     The given file either did not exist, could not be opened, or was
     not found.
 
     Make sure the environment settings are valid and that the correct
     path name for the file is specified.
 
     If this error appears without an error message, the compiler has
     run out of file handles. If in DOS, increase the number of file
     handles by changing the FILES setting CONFIG.SYS to allow a larger
     number of open files. FILES=20 is the recommended setting.
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