Whenever you have a list of unique key values identifying one file in a directory, but the file name contains other text as well it is possible to use wildcards in order to open the file you want.
Below code snippet will do the trick for you.
The function Dir() returns an empty String (""), in case a file could not be identified. Therefore you will need extra handling for this case.
In case more than one file was identified by Dir(), only the first file (whichever the first may be) is returned.