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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     Error U1506
 
     cannot open file 'filename'
 
     PWBRMAKE could not open the given file.
 
     One of the following may have occurred:
 
        ■ No more file handles were available. In DOS, increase the
          number of file handles by changing the FILES setting in
          CONFIG.SYS to allow a larger number of open files. FILES=20
          is the recommended setting.
 
        ■ The file was locked by another process.
 
        ■ The disk was full.
 
        ■ A hardware error occurred.
 
        ■ The specified output file had the same name as an existing
          subdirectory.
                                    -♦-