### Please describe the problem.

Can't clone repository on Windows 7 64bit

### What steps will reproduce the problem?
git clone git://git-annex.branchable.com/ gitannex

...

error: Invalid path 'doc/walkthrough/fsck:_verifying_your_data.mdwn'

error: Invalid path 'doc/walkthrough/fsck:_when_things_go_wrong.mdwn'

error: Invalid path 'doc/walkthrough/quiet_please:_When_git-annex_seems_to_skip_files.mdwn'

error: Invalid path 'doc/walkthrough/removing_files:_When_things_go_wrong.mdwn'

error: Invalid path 'doc/walkthrough/transferring_files:_When_things_go_wrong.mdwn'

Checking out files: 100% (7235/7235), done.

git status shows many deleted

git reset --hard shows same error as clone

### What version of git-annex are you using? On what operating system?
git annex version

git-annex version: 5.20150219-g3fc8d83
build flags: Assistant Webapp Webapp-secure Pairing Testsuite S3 WebDAV DNS Feeds Quvi TDFA TorrentParser
key/value backends: SHA256E SHA1E SHA512E SHA224E SHA384E SKEIN256E SKEIN512E MD5E SHA256 SHA1 SHA512 SHA224 SHA384 SKEIN256 SKEIN512 MD5 WORM
 URL
remote types: git gcrypt S3 bup directory rsync web bittorrent webdav tahoe glacier ddar hook external
local repository version: unknown
supported repository version: 5
upgrade supported from repository versions: 2 3 4

git --version

git version 1.9.5.msysgit.0

Windows 7 64bit


> Here's a nickle kid, go buy yourself a real OS that supports
> colon in filenames.  
> 
> Windows has all kinds of stupid limitations that are enough fun
> making git-annex support, without trying to make its source/website
> repo also avoid them. 
> 
> The solution is cygwin; git-annex's windows autobuilder uses cygwin's
> version of git to check out its git repository, and that should work for you.
> [[done]]
> 
> --[[Joey]] 
