Dim open workbooks with hardcoding their names

Here is my entire code to open a file from a ComboBox in a userform. How can i alter it to get set the file that it opens as WB1 because this would allow me to reference it in the macro. This code was given to me by someone on this site and i am still pretty new to vba so i am limited. I actually want to incorporate another combobox with it to open another file from the same folder. How would I do that? Thank you in advance for the help.

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