#1429 7ZFM sometimes does not unlock closed files

[quanta]

Tested system 1:
OS: Windows 98SE
Memory: 384MB
CPU: Intel Pentium II 400
Sound: ESS Solo-1
Video: Neomagic MagicMedia 256AV

Tested system 2:
OS: Windows XP SP2
Memory: 4096(3264)MB
CPU: Intel Pentium D 805
Sound: Realtek ALC888
Video: ATI Radeon HD 4850

After a file is opened within 7-Zip File Manager in tested system 2, deleting the file in Explorer after the file was closed in 7-Zip File Manager sometimes causes access denied error to appear, until exiting 7-Zip File Manager. The bug does not affect:

• tested system 1,
• tested system 2 if:
  • the file is deleted inside 7-Zip File Manager
  • delete the file in Explorer a while after the file was closed by 7-Zip File Manager, regardless of whether 7-Zip File Manager is running

In any case, 7-Zip should immediately free the file lock if the file is no longer used.