If you have files on micro sd in your cell ..just use a card reader..and connect it to the computer and it will behave just like a memory card ..usually when you buy a micro Sd card ..it will give you an adapter that transforms it into a regular SD card and will fit in the card reader of your laptop ..If you use a pc desktop with no card reader..and you do not have a adapter for your micro SD ..just buy a cheap card reader for this type of card ..and use it in usb
To actually retrieve the file..copy them from the card's folder or cut them (this operation will remove them from the card ) ..
remember not to mess with the folders on the card cause it will make issues when you plug it back in the phone ..
here is a link for a cheap card reader you may use..but my advice is to get one from your local computer store..and not the cheapest one ..cause you may end up with a strange Chinese made..and not be able to use it ..(its a lottery with this ones..I've bought before devices that worked fine for years and also ones that were broken from the start )http://www.nextag.com/micro-sd-card-reader/products-html
Or ..if you do not have a reader and do not need one ..and still want the files just use the data cable of the phone ..and install the pc suite for it ..and it will see the card from the phone directly ..
Or if you have a laptop with Bluetooth capacity ..transfer the files via Bluetooth ..