Fonts without file extension, install on Windows?

I downloaded the trial version of CrossFont – that did the trick.

I only had to open the folder with the .-FontName files add the output folder and convert them one by one.

In this solution there's no need to rename any of the files.

This is a Mac OS 9 style font file that stored all font information in the resource fork of the file, that appears as a dot-underscore file when moved to Windows.

It is identified as a PostScript font by the file header, and you might be able to rename the file to .pfb or .otf, but it's not guaranteed to work without conversion.

Looks like you have PostScript fonts (based on having two files, plus the "PS-AdobeFont" tag)

The two files should have the extensions .PFM and .PFB

Windows has had support for PS v1 fonts since Windows 2000, so you should just be able to install them via the regular font install method(s).

For Vista:

1. Select “Control Panel” from the Start menu
2. Select “Appearance and Personalization.”
3. Select “Fonts.”
4. In the Fonts window, Right Click in the list of fonts and choose “Install New Font.”
5. Navigate to the folder that contains the fonts you want to install.
6. Select the fonts you want to install. You can click to select one font, Control-click to select several fonts, or Shift-click to select a contiguous group of fonts.
7. Press the “OK” button to install the fonts.
8. Close the Fonts control panel when you are finished.
9. The fonts are now installed and will appear in the font menus of your applications.

More info available at Adobe's site.