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I have a mediawiki set up on an IIS7 server. It was set up as described in the manual. I activated file upload as described here. I think I've got the folder permissions right: modify-read-write for the IIS_IUSRS group on the images subdir of the mediawiki install. My php.ini also allows file uploads.

When I try to upload a png image, I can see a temporary file with a name of phpF267.tmp being created in a temp folder that is obviously a png file (magic header). However, Mediawiki tells me that it was unable to open the lock file for mwstore://local-backend/local-public/f/f1/bla.png and does not copy the file. It does not even create the directories f/f1 in the images folder.

Any ideas what might be wrong?

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Sometimes you can fix this by
Turning off these settings in LocalSettings.php

$wgUseImageMagick = true;

$wgImageMagickConvertCommand = "/usr/bin/convert";

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