Hi misscrf,
You will need a copy of Impromptu to be able to open .imr files. Also, unless they are snapshot reports which contain the data as well as the report definitions, I'd hope you also have more than just .imr files too - you'd normally need either some hotfiles (.ims) or a catalog (.cat) and relevant instructions to connect it to it's database.
If you can get a copy of Impromptu (and if your reports are snapshots, or if you have a catalog, or if you have the hotfiles), you will be able to open the reports and save them in another format such as pdf, csv,excel,html etc.
Best regards,
MF.