The Volume Shadow Copy Service (VSS) can be used to mount a copy of a drive in a crash consistent state (like you just unplugged your computer) as a different drive letter. My shadow task command line tool makes it easy to do this. Here's an example:
ShadowTask64 C V test.bat
This creates a shadow copy of the C: drive, mounts it as V: and then runs test.bat. When test.bat completes the shadow V: drive is removed.
What can you do with this?
The simple case is grabbing a copy of a locked file. In this case test.bat could just run pause and then grab the file you need from V:.
It's also a great way to run a backup. In this case the batch file can run XCOPY (to a network share or portable drive) and you'll get all your files including anything locked like running executables or Outlook PST files.
Grab the latest from GitHub: abfo/shadow/releases. You'll find a ZIP file and source code if you want to use/extend this. There are 32 and 64-bit binaries - you need to use the right one for your computer and you also need to run the tool with administrative privileges. This only works with NTFS drives.