I tried adding an 'Environment variable' with the name "PATH" but I found another entry with the same name. can I change the old one to a different name? I tried openning "GPAC" folder, but didn't understand much and didn't know what to change in the configurations file

Duplicate Environment variables

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    yeah, you don't want to do that. – Frank Thomas Jul 10 '14 at 16:07

Do not remove or rename the PATH variable!

Instead, just edit the existing PATH variable, add a delimiter (which is ; in Windows) and then add your new path.

Would result in something like:

C:\Windows;C:\Program Files\GPAC

Why you shouldn't delete it:

Wikipedia: PATH

This may result in a broken system (I've never tried it), but you won't be able to just run cmd anymore, you'll have to type C:\Windows\cmd.exe because Windows won't know where to look for executables without the PATH variable.


To add multiple path values under the PATH variable separate your values with a semi-colon.

  • To be clear, this is only true for certain variables. For instance adding another path to the TEMP variable would just break things. – EBGreen Jul 10 '14 at 15:33
  • To be clear he said "PATH". So what's your point? – Iraedei Jul 10 '14 at 15:38
  • My point is that your answer implies that you can do this for any variable. – EBGreen Jul 10 '14 at 15:42
  • There I fixed it for you. The other answer is more comprehensive though regardless. – EBGreen Jul 10 '14 at 15:43
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    No biggie. It's just that the goal of the stack exchange sites is to provide ideally the one best answer for each question. – EBGreen Jul 10 '14 at 16:01

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