D1 extension is related to Progress Database file. These files can be opened by Progress firms softwares.
D1 extension is related to database files. These file formats are created by Progress firm. You can try to open d1 files with the softwares of this firm. If you need to learn more about the programs, you can try to check its official web page. Here is the link below.
What to use d1
which page related to d1 file
d1 Related Searches
You can check related links about d1 fileextension.