Open a file with wildcard

[apeso]

I have on my desktop the file "C:\Users\Alan\Desktop\conexion sai.rdp" and only exists one file with that extension.
I plan to install this macro on many computers that also have an this file but the name will be different. And I have tried things like:

Code:

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If(!FileExists("$desktop$\*.rdp"))

mes- "File does not exists" "Error" "x"
;;_________________________________ or
If(!FileExists("$desktop$\"*".rdp"))

mes- "File does not exists" "Error" "x"

Could you please tell me the correct syntax