Yesterday I opened two custom xlf files (from a client-specific solution, no idea what technique is behind it).
Anyway, in the project list on the dashboard, these files do not have an entry with their name as such (as would be expected, e.g. example.xlf), but only with the directory name where these files where located (e.g. Project_XY). Though they had the same directory name, the right file opened when selecting this entry.
I do not know if this happens with any other file format. At least the files are treated correctly, as the re-import works fine.