Thank you for your interest in syncfusion products.
We regret to let you know that currently we don’t have file type support in CellEditType. We suspect your requirement is to have upload control option and upload certain file. Could you please provide more information about your requirement that what type of file you mean like image or some thing else.
Please let us know if you have any queries.
Thanks for your update.
Your requirement of having UploadBox for each rows in grid and uploading files for specific rows can be achieved by having UploadBox in ItemTemplate of Grid. Please refer to the code snippet below.
<syncfusion:UploadBox ID="UploadBox1" runat="server"
AutoFormat="Office2007 Blue" Width="100%" OnFileUploaded="file_uploaded"
ShowSubmitButton="true" ViewStateMode="Enabled" />
Please refer to the below link to download the sample application.
Please let us know if you have any concern.