Version 3.4.2 has a minor bug: Files in the Custom directory aren't read. This is the default place to put your own files to modify tclhttpd. This will be fixed in Version 3.4.3.
You can change the 3.4.2 version as follows:
In httpdthread.tcl, change
if {[string compare $f "pkgIndex.tcl"]}to
if {[string compare $f "pkgIndex.tcl"] == 0} {This page should be deleted when V 3.4.3 is released.