Both .pm4 and .p65 files are from Adobe PageMaker and if any program can somehow work with them, or convert them, it would be it. However, it seems like files used in different versions of the program, so you may need a specific version of PageMaker in order to convert the files or somehow resave these two files.
Convert Adobe PageMaker 4 Document to Adobe PageMaker 6.5 document.
We found one software available in the database for this conversion.
Microsoft Windows software - convert pm4 to p65 on Windows
One of the first desktop publishing programs on market
Convert from pm4 file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.