ManagementEventWatcher.Start throws an exception when a power plan doesn't have a name

[wcruppel]

Description

I've created a System.Management.ManagementEventWatcher instance that I'm using to monitor for creation of new power plans. But, if a power plan exists that does not have a name, calling Start throws System.IO.FileNotFoundException.

Reproduction Steps

Export the standard Balanced power plan, delete it, reimport, but do not give it a name.

powercfg /export %TEMP%\Balanced.pow 381b4222-f694-41f0-9685-ff5bb260df2e
powercfg /delete 381b4222-f694-41f0-9685-ff5bb260df2e
powercfg /import %TEMP%\Balanced.pow 381b4222-f694-41f0-9685-ff5bb260df2e

Then, run this code:

ManagementEventWatcher watcherCreate = new ManagementEventWatcher (
new ManagementScope ("\root\cimv2\power"),
new WqlEventQuery (
"__InstanceCreationEvent",
new TimeSpan (0, 0, 5),
"TargetInstance isa "Win32_PowerPlan""
)
);
watcherCreate.Start (); // BOOM!

Expected behavior

Start the watcher without throwing an exception. i.e. should not care if a power plan has a name or not.

Actual behavior

Throws System.IO.FileNotFoundException

Regression?

Dunno. Probably not.

Known Workarounds

None

Configuration

.NET 10.0.3
Windows 10 19045.6937
x64

Other information

No response

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