http://amap-tarnos.fr/?kastrylja=site-de-rencontres-africains&c76=48 Windows explorer preview locks file.

imprezy dla singli krak w 2021 Explorer of Windows has Preview pane. It is nice but as a default, it locks the file in preview.
Which means, the file can not be modified, renamed, or saved.
To change the behavior, add a value to the Windows registry according to this instruction.

http://support.microsoft.com/kb/942146