Read-Only files hosted on a Unisys MCP fileserver cannot be deleted with a windows client (XP SP2 and later)
A Windows computer that is running Windows XP SP2 or later (Windows Server 2003, Windows Vista, Windows 7) attempts to delete a file that is saved on a Unisys MCP file server. It appears to the user that the file has been deleted, (e.g. the file disappears from the Explorer window, or from the Command Prompt, and no error is returned) but in fact, the file has not been deleted.
For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB2008001.