COM server usage question

[Propad]

Hello everybody,
I created a simple COM server, by copy and paste of the first example
from the book by Mark Hammond. I registered the server, and was able
access its functionallity from another python script, and from Word.
Then I tried accessing the server from another tool (which is my real
task). The problem was, it was not in the dropdown list of servers
usable by the tool. The alternative was to specify a position of the
server, by giving in the location of a .exe or .dll or .tlb file.
So after browsing my registry and this newsgroup for a (long) while,
my conclusion is:
-all com servers in the mentioned drop-down list are entries in the
HKEY_CLASSES_ROOT\TypeLib registry entry
-in order to get my server into that list, I have to somehow specify
that before registration. My guess would be I need to somehow use the
_reg_options_ attribute. But if, how?
-as an alternative I could write an *.IDL file, compile it to *.tbl,
and feed that into the calling tool. I've seen the example given at
the c_types page. But how do I know what entries to put into the *.idl
file? Meaning specifically the GUID-s. I'm sure theese are allready
somewhere in the registry, so I can't just go and create new ones. Can
the GUID-s for the type library, interface and implementig class be
derived from the GUID I used when creating the server? And also, where
do I get a working midl - compiler? I found two on my computer, but
neither seems to be working, asking for a cl compiler.
I thank you kindly for your help.
Regards,
Nenad Propadovic