I got it to work! After having tried many different ways to hopefully link to my file directories, it occurred to me to try to use the information that the GM import program listed in its error message, which follows:
Warning: chdir(): No such file or directory (errno 2) in /www/c/cowger/docs/weblog/wp-admin/import-greymatter.php on line 32
Wrong path, /oldweblog/archives doesn’t exist on the server
Previously, I had entered “/oldweblog/archives” into the “Path to GM entries” box (along with many other versions in my attempt to get the program to work. Finally getting it right, I entered the following in the “Path to GM entries” box:
/www/c/cowger/docs/oldweblog/archives
It worked! Keep in mind that “/www/c” are parts of the directory information that I never have to enter when I work with my weblog and server–but the server still uses them.