If you are trying to run Credential Store for Git in Bash on Windows it can be painful trying to work around the directory syntax. The command below is will overcome this and assumes Git is installed to c:\program files (x86)\git\bin.
$ git-credential-winstore -i /c/Program\ Files\ \(x86\)/Git/bin/git.exe
You must run this in the directory where
git-credential-winstore.exe is located.
Happy Gitting :)