### Please describe the problem.
When I try to create the repository with the suggested location `C:\Users\bbigras\Desktop\annex\` I get "Cannot write a repository there". I didn't see the program output any errors on the console. [screen capture](http://imgur.com/7ZUqqVQ)

It works if I change the path to `C:\Users\bbigras\annex\`.

### What steps will reproduce the problem?
* run `git annex webapp`
* click `Make Repository`

### 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\webapp9924.html
"""]]

> It checks if the directory can be written to, and it seems that for some
> reason Windows is preventing you from writing to your Desktop. That seems
> really weird to me (and I have not seen that behavior). But, I can easily
> make it check if that's the case, and fall back to the other path, so
> have done so. [[done]] --[[Joey]]
