How can Dir() in Excel VBA allow access to multiple types of files?

edit

Dir() can allow access to multiple types of files by using wildcards in the file extension parameter. For example, to search for all Excel files in a directory, you can use ".xlsx" as the file extension parameter. To search for both Excel and CSV files, you can use ".xlsx|.csv". The "|" character represents "or" in the file extension parameter, allowing Dir() to search for multiple types of files. Additionally, you can use the ".*" wildcard to search for all files in a directory.