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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documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.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 U1507
 
     cannot open temporary file 'filename'
 
     PWBRMAKE could not open one of its temporary files.
 
     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 TMP environment variable was not set to a valid drive and
          directory.
 
        ■ The disk was full.
                                    -♦-