I am moving from PowerDesk Pro to another file manager that is compatible with Windows 11. In PD Pro you can select a file, then choose encrypt/decrypt off of the drop down menu and either encrypt sensitive files or decrypt them using a password. I am looking for similar functionality in the file manager I move to. Does Opus support this? Thanks.
A button that runs SetAttr TOGGLEATTR=E will encrypt/decrypt files using the method that's built into the Windows filesystem (assuming it's enabled on the drive in question).
The result will be the same as opening the Properties dialog and going into the advanced attributes section to turn on encryption for the file there. That method also works in Opus (without having to create any buttons etc.) and is how you'd do it in File Explorer.
Alternatively, you can add the file(s) to an encrypted archive by selecting them and clicking the Archive Files button, then filling in the password.
(BitLocker is a third option, if on a Pro version of Windows, but encrypts entire partitions rather than individual files/folders.)
Note you’ll need to be running Windows Pro for file encryption as well, and it’s a login-based encryption - so if you’re only running with one user login on your device, the files will be transparently decrypted. Only other user logins won’t be able to access them.
I’m motivated to warn OP that application-specific encryption is neither secure nor robust. Lose the app (or have it updated with a non-backwards-compatible encryption), lose the files. And the app will never be as thoroughly tested as an open-source encryption tool.
Something like GPG4win might be what he wants - very secure, and unlikely to be going anywhere.
BitLocker can also encrypt virtual hard disk files (.vhdx containers). That's an interesting option if you need to edit files or deal with large files.
None of the encryptions Opus supports are specific to Opus, so that isn't anything you need to worry about in this case. They're either part of Windows or part of the archive formats, depending on the method you use.