Yep, this is possible.
You need to import the file using the file import wizard (at least that's how we've done it on 4.2 - we don't have 5.0 and we change desks every day so not fat client on my PC to check). You'll also need to know the view the report relates to.
Have a look at the historical reporting and data dictionary pdf. It will tell you how to import and also gives the view for each report. Remember too to prefxi this with the letter appropriate to the time interval you're interested in (i,d,w,m).
DD