Open File Name Error

I have code which show HTML file but some of user have problem open file name but i have no problem in my system so can any one help me in this problem.

Below are code

filenum = Freefile()

Call uidoc.GotoField("TextBuffer")

filename$ ="c:"+"TI- "+Left(Doc.ReferenceNo(0),15)+".html" 

Open  filename$ For Output As filenum

Subject: Open File Name Error

It show unable to open file error

and this file is created when my agent running at run time and after that i have kill this file but some user’s have problem when it create in my system it is working fine but some user’s syem not working

Subject: RE: Open File Name Error

Are you sure your users are allowed to write to the c: drive root?

Subject: RE: Open File Name Error

Yes i am sure

Subject: RE: Open File Name Error

Sure as in “that’s the way it’s supposed to be”, or sure as in “I actually went to the users’ desks and checked things on their computer personally”? And have you tried debugging on the users’ machines, perhaps by inserting Print statements?

Subject: What does ‘having problems’ mean

Do they get an error message?Is the file on their pc?

More data, please.