is intended to work with data files generated in a previous version of LispWorks. In particular you can load data files generated by LispWorks 4.3, LispWorks 4.4 and LispWorks 5.0 into LispWorks 5.1.
The pathname specified by
must be recognized as a fasl file, otherwise
will load it as a text file. LispWorks recognizes a fasl by its file type matching the value of *binary-file-type* or being in the value of *binary-file-types*.
The default fasl file type in LispWorks 5.0 and later differs to LispWorks 4.x on Windows and Linux, as described in compile-file. Therefore you may need to do something like this to ensure your LispWorks 4.x data file is recognized as a fasl file when loading it in this version of LispWorks:
type in LispWorks 5.0 and later is larger than in LispWorks 4.x on Windows and Linux. A
dumped in a LispWorks 4.x data file will be loaded as a
in LispWorks 5.0 and later if its value is within the
LispWorks User Guide and Reference Manual - 21 Dec 2011