When we download files from some Asp.net Page using the Response Header. If the file name contains any space then In Firefox it gets only the first word from file name and make it available to download, so after downloading the file due to lack of File Extension, a user faces problem in opening of the file. Also file would be in improper name.
Cause of Problem
Normally we use following line of code in our application...
Response.AddHeader("Content-Disposition", "attachment; filename=" + filename);
This will skipped the following words from the file name
ex. If file name is : ABC MNO XYZ.xls then browser will download file with name ABC without extension.
We can use following line of code which works properly in any browser...
Response.AddHeader("Content-Disposition", "attachment; filename=\"" + filename + "\"");
This will download file with full name.