Old Adobe PageMaker templates may still be opened in modern programs like Adobe InDesign and used for work or export purposes, like exporting certain elements and saving them as .jpg files. Of course the easiest way would be to find old copy of PageMaker and export the template (.pmt) from there.
Convert Adobe PageMaker template to JPEG bitmap image format.
We have found 2 software records in our database eligible for .pmt to .jpg file format conversion.
Microsoft Windows software - convert pmt to jpg on Windows
Professional desktop document publishing software from Adobe
Convert from pmt file format
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 pmt to jpg. 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 pmt to jpg on OS X
Mac version od Adobe's popular document designing and publishing software