How to open Adobe PageMaker template .alt3 files
Have you had trouble opening the alt3 file on your computer? What are alt3 files? We explain what they are and recommend software that we know will open them.
What is alt3 file?
An alt3 file extension is related to the Adobe PageMaker. An alt3 file stores document template.
Adobe PageMaker template description
The alt3 file extension is associated with the Adobe PageMaker for Mac.
The alt3 file contains PageMaker document template.
Most likely some old format without support. No further information could be found.
Suggested software to open alt3 file

Adobe Pagemaker for Mac
Mac version of once popular publishing program