To make this work, you must first register a custom protocol (pmd-opener://) in your Windows Registry or macOS’s launch services. This turns a simple hyperlink into a true "PMD file opener link."
3DPEA PMD Viewer: A free browser-based tool to view 3D PMD models without software. pmd file opener link
The Reality: Most online converters do not support legacy PageMaker files because of the complex fonts and layout engines. However, if your file is a PlanMaker spreadsheet, you can try: PMD File Opener — Write-up What a PMD file is
First, it is essential to clarify what a PMD file typically represents. The most common association is with PageMaker Document, created by Adobe PageMaker — a desktop publishing program popular in the 1990s and early 2000s. Adobe discontinued PageMaker in 2004, replacing it with InDesign. Consequently, native opening of .pmd files is no longer straightforward on modern operating systems. Less commonly, PMD can refer to Pegasus Mail mailbox files or even GameMaker Project files, but the PageMaker format remains the primary source of user confusion. PMD (Project Model/Project Metadata/Polygon Model Data) is a
SoftMaker Office uses .pmd for its PlanMaker spreadsheet application.