This is an enhanced version of the User Defined Language (UDL) made by LuisPisco. His UDL is found here.

After Installing NotePad++, place the Cisco_IOS_XE_byOsamaAbbas.udl.xml file within the %AppData%\Notepad++\userDefineLangs folder, and restart NotePad++.

Files with extensions .cisco, .ios, .xe, .log, .txt, .conf, and .config will automagically use this new UDL as their default language when opened with NotePad++. Remove or add any extension when desired.

To change this behavior:

1. Open the Cisco_IOS_XE_byOsamaAbbas.udl.xml file.
2. For example, remove txt from the ext property in <UserLang>.

<UserLang name="Cisco IOS XE" ext="cisco ios xe log conf config" udlVersion="2.0">

3. Save the UDL file.
4. Restart NotePad++.