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I have these files, which were all in one .zip:

DPMANUAL.MAN
DPMANUAL.STR
DPMANUAL.IND
DPMANUAL.I01
DPMANUAL.I02
DPMANUAL.TAB
DPMANUAL.TXX

They are supposedly a manual (for DataPerfect).

The file command says that the .STR is "Corel PlanPerfect macro, v1.3" and the others are "data."

Opening the files in LibreOffice does not work. When selecting "Word Perfect" (which I thought it would be) they are not recognised.

What format is it? How do I convert them to something useful, preferably PDF ?

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At least some of those files are DataPerfect files: .STR files are structure files, .IND files are index files, and .TXX files store data stored in variable-length text fields (see Mastering DataPerfect for details).

The DataPerfect manuals are available as WordPerfect files and PDF files from the DataPerfect Users Discussion Group, as is DataPerfect itself (it was released as freeware in 1995 and maintained by its original developer until 2008).

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It would make sense that a manual for DataPerfect would be stored as a DataPerfect database - after all, handling arbitrary data was its main goal.

.TXX, .IND, .Ixx and .STR are known as DataPerfect file extensions.

Maybe have a look at these pages, especially the download area which offers an archive with DPEXPIMP, a tool to extract information from a DataPerfect database.

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  • Did you manage to actually download anything from that site? The FTP server seems to be broken (logging in complains about not being able to change directory to /var/ftp/).
    – Stephen Kitt
    Oct 27, 2022 at 15:52
  • Nop, just searched for some place offering DPEXPIMP, as I remembered that tool.
    – Raffzahn
    Oct 27, 2022 at 16:05
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    DPEXP.COM and DPIMP.COM are available in the main DataPerfect archive.
    – Stephen Kitt
    Oct 27, 2022 at 16:07
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    That opens up a perfect chicken-and-egg problem, especially for the installation manual ;) Very clever idea ;)
    – tofro
    Oct 27, 2022 at 16:37

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