Getting PATH of running *.exe

In XP and above you can use the “System Information” tool, which shows the path.  You can run this from the menu at “Start” → “All Programs” → “Accessories” → “System Tools”, or from the command line as msinfo32  (or “Start” → “Run…” → msinfo32 ENTER).

Click on “Software Environment” → “Running Tasks”, and the path is shown.

http://www.raymond.cc/blog/determine-program-path-from-task-manager-for-each-program-in-windows-xp-windows-server-2003/

Using Windows Powershell, if you want to do find out the path for "firefox.exe, you could do:

(Get-WmiObject -class Win32_Process -Filter 'Name="firefox.exe"').path.SubString(0, (Get-WmiObject -class Win32_Process -Filter 'Name="firefox.exe"').path.LastIndexOf('\'))

This would return:

C:\Program Files (x86)\Mozilla Firefox

Replace "firefox.exe" with desired executable.