1.4: Files invisible in long path names if WebDAV but not Dokany (Win10 x64 1803 Enterprise)


Files and folders disappear (but still exist!) if the path name exceeds a certain length under WebDAV.
The files will show up again, if the path name is shortened (e.g. by shortening one of the parent folder names).
The files will also show up if the drive is mounted using Dokany.

When does it occur:
Main cause is when files or folders are copied or moved into too long folder paths - the data seems to completely disappear (but actually is still there).
Other cause is renaming parent folder names resulting in exceeding path length in sub folders.

This is a serious problem for two (obvious?) reasons:

  • we cannot find the files
  • we may accidentally delete files when deleting seemingly empty folders that actually contain invisible data.

Other related issues:

  • when trying to modify file names exceeding the maximum we receive errors pretending the file does not exist
  • trouble deleting folders containing hidden data without explanation as to reason (actually a good thing but confusing as there is no prompt why the deletion failed)
  • supposedly “missing files” reported in this forum may be a result of this bug.

It is hard to figure our what the exact path length is, but is is somewhere around 248 including the Cryptomator drive name.
The location of the encrypted files (i.e. the path length of the folder the encrypted files reside in) does not seem to be relevant with regards to this issue.

Currently using version 1.4.7 but the problem has occurred in earlier versions too.
System is Windows 10 x64 1803 Enterprise

Cryptomator - Empty folders on Windows

I played around for some reproduction attempts. (on windows 10 pro 1809)
Here are some more information, maybe that helps also:

With webdav it turns out that windows is complaining at the moment when the path (only folders) length is 240. A folder structure with 240 digits will not allow to create any files, or copy of anything to a local place. (you have to delete 2 digits to copy the path to a local drive)


On Dokany, it’s a similar, but not “consistent” behavior. It allows to create 248 paths in the vault, but if you want to copy something out of the vault (or into it), you have to go down to 224 digits. I also noticed, that if you want to copy a (too long) path out of the vault a part of the folders is copied to a local storage when the error message appears. (On Webdav nothing is copied if the path is too long).

But in any case I got a message that the path is too long. I did not get the message that a file would not exist

And If I want to create that long path names at a local storage area, I receive the same message and experience the same behavior as on a webdav vault. So In my case I was not able to even create a file with that long path on my local drive, or directly in a vault.
I could imagine that there be a compatibility issue if you create and feed your vault on environments that allow file paths with more than 240 digits, and then try to open the vault on a windows machine that does not allow such long path names.
Anyway, I wasn’t gonna be able to create files in long paths on the “local environment”, or directly in the vault without windows warning me that the path is too long.

So for me it feels like a “windows vs linux vs mac” thing.


This post was flagged by the community and is temporarily hidden.


sorry for off topic, how can I choose between webdav and dokany?


open cryptomator, click the gear symbol below the list of available drives chose “Docany” or “WebDAV” (applies to v. 1.4.9). I suppose all drives have to be unmounted first to effectively change the mode but I haven’t tried.