### Please describe the problem.
When I try to create an annex on my `D:\` drive I get the following error:

[[!format sh """
Internal Server Error
git [Param "config",Param "annex.uuid",Param "d2277948-4689-41d8-bd55-15c634f38cee"] failed
"""]]

[screen capture](http://imgur.com/w7uPLDp)


### What steps will reproduce the problem?
* run `git annex webapp`
* create annex on `d:\annex`

### What version of git-annex are you using? On what operating system?
[[!format sh """
git-annex version: 5.20131213-g2893b22
build flags: Assistant Webapp Pairing Testsuite S3 WebDAV DNS Feeds Quvi TDFA CryptoHash
key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 WORM URL
remote types: git gcrypt S3 bup directory rsync web webdav glacier hook

git version 1.8.4.msysgit.0
"""]]

Windows 7 64-bit

### Please provide any additional information below.
[[!format sh """
Launching web browser on file://C:\Users\bbigras\AppData\Local\Temp\webapp9400.html
fatal: Not a git repository: '/annex/.git'
error: could not lock config file /annex/.git/config: No such file or directory
"""]]

> I've fixed this! [[done]] Yay!! Get the fix from the hourly windows autobuilder.
> --[[Joey]]