Linux: System.Diagnostics.ProcessStartInfo: With UseShellExecute = true, a misleading exception is thrown when no helper utility (such as xdg-open) is present. #96565

Description

On Linux distros, opening a document or folder path via UseShellExecute = true relies on external helper utilities; specifically, the following ones are looked for, via the Path environment variable, in order, with the first one getting used: xdg-open, gnome-open, kfmclient

In the absence of these helper utilities, an exception is thrown, which makes sense,
but the exception is misleading, as it reports the .FileName property value as nonexistent.

That is, the nonexistence of a helper utility is mistakenly reported as the the .FileName property value's nonexistence (even if the latter actually exists).

Reproduction Steps

On a Linux distro with none of the helper utilities present (if a helper utility is present, the call should open the current directory GUI shell's file manager):

System.Diagnostics.Process.Start(new System.Diagnostics.ProcessStartInfo { FileName = ".", UseShellExecute = true })

Expected behavior

An exception that indicates the absence of a required helper utility.

Actual behavior

E.g. when run from /tmp:

An error occurred trying to start process '.' with working directory '/tmp'. No such file or directory

Regression?

No response

Known Workarounds

No response

Configuration

• .NET 8.0.0
• CBL-Mariner/Linux 2.0

Other information

No response