In WPF, when you place a BlobField in a ViewModelColumn, you can set the taggedvalue WindowsFileFilter to influence what files should be filtered out in the file open dialog.

If the Blob is of Blobtype Image, we use this as the default:

Image files (*.jpg, *.jpeg, *.jpe, *.jfif, *.png, *.gif) | *.jpg; *.jpeg; *.jpe; *.jfif; *.png; *.gif

If the Blob is not of Blobtype Image, we leave it blank (all files show).