How do I make a Screen Saver with Rainmeter?

[balala]

Not sure if the Process measure accepts the | delimiter in order to be able to add more process names in the option (i.e. Process=zzFirework.scr|ZZFIRE~1.scr), like in similar options from the UsageMonitor plugin...

You have just to test it to find out if it does or doesn't work.
So I did a test. Doesn't work.
You probably have to use two Process measures and sum together their value (into a Calc measure). Then you can use this Calc measure to know when the process is running.

[Yincognito]

You have just to test it to find out if it does or doesn't work.
So I did a test. Doesn't work.
You probably have to use two Process measures and sum together their value (into a Calc measure). Then you can use this Calc measure to know when the process is running.

Yep. Well, at least they both work now - better than nothing.

P.S. Seeing that the Metaballs.scr screen saver worked for me using its full name but only did for you when using the 8.3 short DOS name, I think the issue is not necessarily the age of the file or stuff like that, but rather how they are written on the disk (or a permission issue?). Anyway, it's probably beside the point to investigate what looks more and more like a Windows or system issue, rather than a Rainmeter or a skin issue...

[balala]

Anyway, it's probably beside the point to investigate what looks more and more like a Windows or system issue, rather than a Rainmeter or a skin issue...

Right.