Possible enumeration values:

NameValueDescription
xlsx

0

xls

1

docx

2

doc

3

pptx

4

ppt

5

mdbx

6

mdb

7

txt

8

png

9

gif

10

jpg

11

jpeg

12

rtf

13

xml

14

csv

15

pdf

16

tif

17

bmp

18

none

19