In addition to support for UNC share locations, you can use Samba to create a SMB share and then map the SMB share to a drive letter in Windows.
mount -t smbfs //machine-name/share_name mount_point -o username=user name[/domain]
Any SMB share mounted on a Linux machine can be used to create file locations. For example, if you have a file location named LinuxProject which references \\fileserver1\data\LinuxProject and if you have mounted \\fileserver1\data to the mount point /mnt/smbfs/fileserver1/data, Rational ClearQuest Test Manager recognizes the mount point and enables you to browse, associate files, and execute test scripts from the LinuxProject file location.
Similarly, if you did not have a file location created for the share, you could create a new file location and specify the path as /mnt/smbfs/fileserver1/data/LinuxProject and Rational ClearQuest Test Manager resolves this path to\fileserver1\data\LinuxProject.