Question very detailed question about huge filenames problems

Please provide comments and solutions that are helpful to the author of this topic.


Level 1
Thread author
Jan 6, 2019

Hello everyone

  1. The OS is Win10​
  1. The file-system (also on the External hard disks) is NTFS.
  2. I NEVER had this problem, even with very long filenames.​
  1. Third party apps (even Microsoft's PowerRenamer) don't help with this problem (anyway, now the filenames are short).​
  1. I've scanned both the PC and the external HD, repeatedly, with a few apps. All clear.​
  1. I used to have the same problem on computers' main drives, but a simple registry tweak (that I found online) had solved the problem on the PC. Regarding External drives, Google finds absolutely NOTHING on the internet.​

I've got truckloads of items saved onto External hard disks.

After lots of work on my part, their filenames are short.

Even so, very often, I cannot rename them, or easily move them, etc.

Such files are NOT nested inside subfolders etc etc

The problem persists even if/when I move files from the External HD to the PC's C-drive.

I often get this weird Windows message::

"If you change a filename extension, the file might become unusable. Are you sure you want to change it?"

The thing is, I'm not touching, at all, the file-extension. I'm only trying to shorten (a little. or a lot) the NAME of such file(s).

What's going on??

In advance, thank you very much for your help

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Level 4
Feb 6, 2023
Below are the NTFS limits:
  • Maximum disk size: 256 terabytes
  • Maximum file size: 256 terabytes
  • Maximum number of files on disk: 4,294,967,295
  • Maximum number of files in a single folder: 4,294,967,295


Staff Member
Jan 8, 2011
very detailed question about huge filenames problems
See if this helps:

Method to move/copy/delete files using PowerShell:

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