As said by op @dbenham There are multiple ways to handle this:

• In command-line:

for /f usebackq^tokens^=4delims^=^<^> %G in (`wmic volume where "Driveletter like '%C%'" get label /format:xml ^| find "VALUE"`)do @echo/%G

• In bat/cmd file:

for /f usebackq^tokens^=4delims^=^<^> %%G in (`wmic volume where "Driveletter like '%C%'" get label /format:xml ^| find "VALUE"`)do echo/%%G

Change the formatting to xml and the output will change the encode, after that filter to obtain the desired value in one line and on for loop without additional characters and/or linebreaks.

• The encoding of wmic's output depends on where the output is being sent

As said by op @dbenham There are multiple ways to handle this:

• In command-line:

for /f usebackq^tokens^=4delims^=^<^> %G in (`wmic volume where "Driveletter like '%C%'" get label /format:xml ^| find "VALUE"`)do @echo/%G

• In bat/cmd file:

@echo off

for /f usebackq^tokens^=4delims^=^<^> %%G in (`wmic volume where "Driveletter like '%%C%%'" get label /format:xml ^| find "VALUE"`)do echo/%%G

Change the formatting to xml and the output will change the encode, after that filter to obtain the desired value in one line and on for loop without additional characters and/or linebreaks.

• The encoding of wmic's output depends on where the output is being sent