Came across a strange one today.
If you create a brand new data control policy, add a rule for AFT and select "use custom list" it already has all of the following file types selected. When you select "use custom list" is doesn't appear to be emptying the list to begin with. So it's not really a custom list, it's a list that is pre-populated with the Sophos defaults. You have to go through each and every category and manually de-select all of the file types below so that you can then make a "custom list".
Spreadsheet
xlsm
xltm
Script/Markup
inf
ins
js
jse
sct
vbe
wsf
Presentation
potm
ppsm
pptm
Media
mdb
Link
lnk
pif
Image
pcd
Gene
cpl
exe
scr
Executable
apk
bat
bundle
cmd
com
cpl
dylib
elf
exe
o
scr
vbs
Encryption - Sophos
exe
Document
chm
docm
dotm
exe
hlp
isp
shs
xlsm
xltm
Database
mdb
Data
reg
Certificates
crt
Archive
hta
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