|This might not work but it's worth a quick shot:|
Go to the Search box and type cmd (then hit Enter key).
This should produce the command prompt - black box with white writing.
Next type cd desktop (hit Enter). The word desktop should appear in white.
attrib -r -h -s "Fwd Your reservation N G92-0EFI.msg" (then hit Enter)
Now, some words of warning. For this to have a chance of working everything must be EXACT (well, case is not important). Sooo:
There must be the one space between cd and desktop.
There is a single space before and after the minus letters (four spaces in all).
The quotes must be included, as the file name is more than 8 characters.
The file name within the quotes must be exactly how it appears on your desktop, all spaces included and no extra ones.
If this works then it should just repeat the desktop line above it, as if nothing much had really happened. If it is wrong it will say something like "File not Found". In which case double check that you didn't get anything wrong and try once more.
Assuming it works, go back to the desktop and see if the stuck file will now delete.
I'll cross my fingers LOL.
0EFI looks like zero to start (not nought) and ending with I (not L). IF the desktop file will let you change its name to test.msg that would make the typing easier. With a short name like that you don't even need the quotes.
Always pop back and let us know the outcome - thanks