>> The easiest way I know: make a program that will call your exe (eg: the
>> user will execute first the launching program that will run your exe.)
>From
>> your menu option: copy the new exe file with a different name. The
>> launching program must:
>> 1. Look for a new version of exe and if finds it:
>> 2. Delete the old version
>> 3. Rename the new version with the correct file name
>> 4. Run the exe.
>>
>> Be careful when you use this technique with a network app.
>
>why ?
>IMHO this is very good esp. for a network setup
>- I have local versions of the exe on each client machine
>if there is a new version on the server it is copies to the client etc..

As said, in the case when there are incompatibilities between versions. Sometimes, you can't run the old and new version in the same time. Sometimes you need to kick off all users, other times you don't need it, isn't it? No big deal, but it's good to have this in mind.

Vlad