Adobe PageMaker PMD files. Since PageMaker was discontinued in 2004, finding a working opener link requires some care.
For non-PageMaker PMDs, the best "opener link" is actually a paired with a command-line argument. For example:
Host a tiny webpage titled "PMD Opener Hub."
Do not randomly rename the file to .pdf or .docx. That will destroy the data. You need a dedicated "pmd file opener."