Here you go:
1. Download the Frontpage extensions from
http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnservext/html/Unixfpse.asp and place files on SME Server
2. cd /etc/httpd/conf
3. cp httpd.conf httpd.old1.conf
4. pico httpd.conf
5. change the Allowoverride none to Allowoverride all (there are a few of them)
6. Change to directory where you saved the frontpage files
7. sh fp_install.sh
8. Are you satisfied with your backup of the system = Y
9. Frontpage extensions directory = press enter
10. Do you want to install a root web = Y
11. Server Config filename = /etc/httpd/conf/httpd.conf
12. Frontpage admin username = whatever you want
13. Unix Username of owner [www] = this is ok
14. Unix Group of this new web [www] = this is ok
15. Select 2
16. Set admin password
17. Confirm admin password
18. Which local character encoding does your system support = 1
19. Select default language
20. Install new sub/per-user webs now = N
21. Install Virtual Webs = N
22. service https restart
This should get it so the primary domain now has FP extensions.