apache 1.3.26 does not recognize the following

[barryp@xxxxxxxxxxxxxxxxxxx (Barry Pollock)]

php
files with extension `.htm'
The aliases are ignored.

I am using the same httpd.conf that was working yesterday.
version 1.3.26 and 1.3.29 from unstable have the same problem.
There are now errors showing when apache loads.
I updated
debian (stable) to (unstable / testing.
Do you have any ideas?
Barry