It should still be possible to import old. prn files from Lotus 1-2-3 to Microsoft Excel and or similar spreadsheet editor and save them as CSV or in any other supported format. You may also have luck with various text to csv converters, but it is not clear whenever they will accept .prt files.
Convert Lotus 1-2-3 formatted text file to Comma Separated Value.
We found 2 software records in the database related to .prn to .csv file format conversion.
Microsoft Windows software - convert prn to csv on Windows
A popular spreadsheet application distributed with Microsoft Office suite
Convert from prn file format
|Yes, Microsoft Excel supports csv file conversion as a target file type.||Yes||Yes||csv editor||Yes||Yes||Yes||No|
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned prn to csv. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
Apple macOS / Mac OS X software - convert prn to csv on OS X
A popular spreadsheet application from the Microsoft Office suite