[dolphin] [Bug 434428] New: Cannot open specific format files with default utility locally by left clicking, showing "Invalid Protocol"

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=434428

            Bug ID: 434428
           Summary: Cannot open specific format files with default utility
                    locally by left clicking, showing "Invalid Protocol"
           Product: dolphin
           Version: 20.12.3
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: minor
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: crosshe.ipad at gmail.com
                CC: kfm-devel at kde.org
  Target Milestone: ---

Created attachment 136689
  --> https://bugs.kde.org/attachment.cgi?id=136689&action=edit
Sample .nii.gz file. The file is the gzipped file of .nii, which can be
directly opened by ITK-SNAP without unzipping to .nii.

SUMMARY
Recently I cannot open .nii.gz files with dolphin by single left click (this is
the default option when opening files instead of double left click), showing
Invalid Protocol. The specified software to open this kind of file is ITK-SNAP,
where I once assigned it in right click - Open with - Other Application... -
ITK-SNAP with Remember all files of type checked. 

I only encounter this kind of problem recently while this works before, and
assigning again has no effect. 

Strangely, there's no problem when I access files on Network (like sftp on the
server). And right click the file and choose the first option Open with
ITK-SNAP the file is normally opened in ITK-SNAP without Protocol Invalid
alert. 
Other kinds of files are able to open normally with the assigned software. 

STEPS TO REPRODUCE
1. Assign .nii.gz files to ITK-SNAP (once).
2. Open a local or remote (sftp) .nii.gz file.
3. Open a local .nii.gz file by right-click and choose Open with ITK-SNAP.

OBSERVED RESULT
Displays Invalid Protocol when left clicking the local file. 
Normal when right clicking and choose the default opening option. 
Normal when opening the network (sftp) file in ITK-SNAP. 

EXPECTED RESULT


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.10.23.1-lts/5.21.2-1 x64
(available in About System)
KDE Plasma Version: 5.21.2-1
KDE Frameworks Version: 5.80.0
Qt Version: 5.15.2

ADDITIONAL INFORMATION
I'm using Kvantum 0.19.0

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