```
PS C:\Users\marpidone> arc version
Exception
Command failed with error #128!
COMMAND
git log -1 --format=" H ct"
STDOUT
(empty)
STDERR
fatal: invalid --pretty format: H ct
(Run with `--trace` for a full exception trace.)
```
It appears to be trying to execute
```
git log -1 --format="%H %ct"
```
except that it's passing "%H %ct" to PHP's escapeshellarg, which is documented to strip %'s on Windows.
Quoting from http://php.net/manual/en/function.escapeshellarg.php
```
On Windows, escapeshellarg() instead removes percent signs, replaces double quotes with spaces and adds double quotes around the string.
```
Apparently by "removes percent signs" they mean "replaces percent signs with spaces", because that's what it's doing on my machine at least.