Wrong variable expansion with names having a comma but no space [Windows]

[abolibibelot]

I've made a few .bat scripts to rename or compress files dragged-and-dropped onto them. They work with most files which have no non-ASCII characters, but they fail in one particular case: files with a name that has a comma but no space. Apparently, because there's no space, the variable (or rather the argument) is expanded with no quotation marks, and then the comma is interpreted as a delimiter. Is there any workaround?

Example:

chcp 1252
set filepath=%~1
FOR /F "delims=\" %%L in ("%filepath%") DO set letter=%%L
FOR %%F in ("%filepath%") DO (
	set drive=%%~dF
	set filename=%%~nxF
)
FOR /F "tokens=1,2,3,4,5 delims=/: " %%T in ("%~t1") DO set filedate=%%V%%U%%T%%W%%X
%drive%
7z a -mx=7 -md=256m -mtc=on -mta=on "%filename% [%filedate%].7z" %1
pause

Tried this, same result:

chcp 1252
set filepath="%~1"
FOR %%F in (%filepath%) DO (
	set drive=%%~dF
	set filename=%%~nxF
)
FOR /F "tokens=1,2,3,4,5 delims=/: " %%T in ("%~t1") DO set filedate=%%V%%U%%T%%W%%X
%drive%
7z a -mx=7 -md=256m -mtc=on -mta=on "%filename% [%filedate%].7z" %filepath%
pause

If I simply put:

set filepath="%~1"
echo %filepath%
pause

with a test file named “12345,6789.txt" on a volume with letter W: I get:
"W:\12345"

[_Al_]

this seams to work:

@echo off
set "filepath=%*"
echo %filepath%
pause

[abolibibelot]

Oh yes indeed, I had missed that:

%* in a batch script refers to all the arguments (e.g. %1 %2 %3 %4 %5 ...%255)

This seems like a weird oversight for something that's been around for decades.

The quotation marks don't seem to change the result, it's the same with:

set "filepath=%*"

or:

set filepath=%*

I also tested with:

set filepath=%1%2

result: “W:\123456789.txt” – so the comma is missing, yet it does get the complete name with “set filepath=%*”, don't know why.

[_Al_]

Yeah, when there is something not possible to do in windows batch, there is a hack that fixes it. I did not know it either , I had to googled it. That delimiter, besides "," suppose to be also "=" and ";".