As far as I know after 12 years of computing, u\you can not store mutiple documents ( doc,pdf,txt) in one filed. SO what you have to do is to make two tables. One table is the main such as EmployeID, Name, DocID (int) and the second, DocID,DocFile(varbinary(max)). So each file(document) will have one row(record). Make relationsgip beteen the two on DocID. and every thing will work fine.
By the way , Varbinary can store upto 2GB and it is replacement of the image datatype.
Hope this help