Simply right-click your image file, select 'Open with,' then choose One Photo Viewer from the list to open your photo.

Yes, right-click on the photo or use keyboard shortcuts to access customization options like slideshow, crop, resize, rotate, and color adjustments.

The free version offers slideshow, color adjustment, crop, resize, rotate, and clipboard copy/paste, all accessible via right-click or keyboard shortcuts.

Right-click on the photo and select 'Slideshow,' or press the assigned keyboard shortcut to start the slideshow feature.

Pro version adds a toolbar and thumbnail browsing, enhancing navigation and editing capabilities. You can upgrade via the app or settings menu.

Go to Settings > Language, select your preferred language from the list, then restart the app for the changes to take effect.

Yes, it is completely free and does not display any ads, providing a clean user experience.

Visit the official website onephotoviewer.com, or check the app's settings for upgrade options under 'Support & Upgrade'.

Try restarting the app, ensure your system is updated, or reinstall the app. Contact support if the issue persists.

Yes, the app is touchscreen compatible, allowing you to navigate and edit photos with touch gestures on supported devices.