[MTUSUPPORT]

When you say you can't change the folder to where your "Kar" files are located, is this the file extension? If so, Hoster will not support this format. Hoster only supports the .kma format.

To change your folder make sure you are doing the following:

1) Open Hoster
2) Click on the Import Tracks Tab
3) Click on the Save to Folder button
4) At the top it states Look In and most likely on yours it shows Local Disk [D:]. Below you should see all your other folders on this drive in the white Window. Double click on the folder that you wish to select so that it then opens. For Example you have a folder on your D: Drive called Hoster Songs. Double click on this folder. It will then open up and be the folder that shows in the Look In Text box as stated in the begining of this step.
5) Now when Look In shows your folder name next to it such as Hoster Songs, click the select button down at the bottom right.

NOTE: If you click the select button before you have actually opened the folder as in step 4, it will only show your root drive.

Let me know if this works.