You can also checked if you have read access to the file/folder? If you are calling within another software, check (1) what is the current working dir and (2) if you have write access to it. Maybe launch this software via cmd.exe from a known working dir.
Unfortunately, I was not able to duplicate the issue from myside.
I am using Redhat 6. What OS that you were using? Modelsim is quite mature product, most probably due to individual computer environment issue.
We will try to provide you as much as support that we can. Do not worry on this.
We do not receive any response from you to the previous question that we have provided. Please post a response in the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you with your follow-up questions.