As Alan said, you can do that (but LangSecRef is not a good name for that since it's not a language issue ;-) ), or declare an environment variable beforehand - no need fot a batch script then.
I fully agree and those were my first thoughts, but :-
the quoted example commences with the presumably unique LangSecRef_3022,
There is the implication that this could be only one of 100 identities in the 10,000 range LangSecRef_0000 to LangSecRef_9999
I chose to set a variable with the same name to concisely indicate what it related to.
The requirement was to avoid editing the *.ini, which can be quite long and tedious to edit.
I chose a batch script and the code snippet as a simple two line explanation,
instead of providing complex navigation instructions upon how and where to set a USER or SYSTEM environmental variable.
The code example given by OP includes the line
"Warning=This process needs to be customize for full support. Change the "xxxxxxxx" line to your skype name!"
This implies that although the OP may know how to set a USER variable, he may be supplying this for other people who do not know, and perhaps have no authority, to set variables.
NB The batch script does not need to be edited;
it could simply prompt for the skype name and set the variable to the user input.
I far prefer %APPDATA% to %userprofile%\AppData\Roaming
%APPDATA% is valid for XP as well as Vista and W7
I find this very useful :-
http://wapedia.mobi/en/Environment_variable?t=5.#5.
Finally, is the specific "skype name" required ?
My experience is that CMD.EXE will happily execute the command
CD %APPDATA%\Skype\*\Chatsync
This is useful where Firefox seems to have an irresistible urge to invent random character strings for user profiles.
If there is more that one match for the wild card \*\ the CD command will take its pick,
which could be a problem if one user has more than one skype name
With a bit of luck CCleaner.ini would have the same capability of using a path with a \*\ wild card
How about using
FileKey4=%APPDATA%\Skype\*\Chatsync|*.*|RECURSE
FileKey5=%APPDATA%\Skype\*\voicemail|*.dat
Regards
Alan