hydrusnetwork / hydrusnetwork/hydrus
Can't open pictures in external program (xnviewmp)
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- Dominant language
- Python
- Stars
- 3.2k
- Forks
- 207
- PR merge metrics
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Description
Environment
Hydrus version: 423 (executable)
Platform: Windows 10
OS specifics: 20h2
What happens
Trying to open any image with an external program (could be limited to just xnviewmp) returns the following error:

Steps to reproduce
- Open Hydrus
- Right Click on any image, Open -> in external program
- The error will appear
Desired outcome
The picture opens in xnviewmp
Error message / Log file / Screenshots
Attached under "What happens"
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the issue in Hydrus version 423 on Windows 10 with XnViewMP, following the listed right-click workflow and reviewing the attached error screenshot. Trace the external-program image-opening entry point and determine why the launch fails; done means the selected picture opens in XnViewMP without the reported error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- python
- Domain
- desktop
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100