If you want to do the import in code, look at the TransferText method in the Access help area.
Both the method mentioned by TJoy, and the TransferText method (which is just the command version of what TJoy recommended), are less than ideal if you are not wanting the text to be imported in to a table.
If you want to simply read the information and import it in to a variable, then you are going to have to use the following:
Dim FileString as string
Open FullyQualifiedPathAndName For Input As #1
Do Until Err<>0
FileString=FileString & Input(1,1)