error with xltx file on mac snowleppard server

One of my users has iger and using mS office 2004 and when she tryes to access a file with .xltx it gives an error of prevent conversion of this workbench

Yet she copy that file locally and it works fine

Also all other extstion work fine

I wet to my laptop and have no issue but I have ms office 2008 that the only difference I try to install open xml convertor b ujt it did not work the issue still occured


any suggest on how to fix this issue?


Thanks