The papers on my site are either in gzipped PostScript format (older papers) or (more recent ones) in PDF format.
If you have trouble with PostScript, I recommend installing Ghostscript, with the Ghostview previewer.
You also can use this online viewer, which will work with *.ps.gz files.
Alternatively, you can decompress the .gz file (with any good archive program, like gunzip or 7-zip),
and then convert the ps file to pdf online with PS2PDF.