Hi there! I understand you're having trouble opening a shared track text with The Mantrailing App, and it’s not showing up as an option in the "Open With" menu on your Windows device. Let’s work together to get this sorted out.

A few quick questions before we dive in:
1. What format is the shared track text? (For example, is it a GPX file, a text file, or something else?)
2. How are you trying to open it? Is it through a file explorer, email attachment, or another app/browser?
3. Have you used The Mantrailing App to open similar files successfully before, or is this your first time?

Meanwhile, here are some steps to try based on common scenarios with shared track files:

### Step 1: Verify File Format & Compatibility
- The Mantrailing App usually works with GPX files for trails. Ensure the shared text is saved/exported in a GPX format.
- If the file is in plain text or another format, The Mantrailing App may not recognize it directly. You might need to convert it or import it through the app’s internal import feature.

### Step 2: Use The Mantrailing App’s Import Feature
- Open The Mantrailing App on your Windows device.
- Look for an import option within the app menus—typically under "File" or "Trails" > "Import."
- Navigate to the location of the shared track file and select it to import. This bypasses the "Open With" menu limitation.

### Step 3: Associate GPX Files Manually (For Future Ease)
Since "Open With" doesn't show The Mantrailing App as an option:
- Right-click the GPX file in your file explorer.
- Select "Open with" > "Choose another app."
- If The Mantrailing App is not listed, click "More apps" and then "Look for another app on this PC."
- Navigate to where The Mantrailing App is installed, select the executable, and check "Always use this app to open .gpx files."
This manual association can add it to your Open With options.

### Step 4: Check for App Updates
- Ensure you have the latest version of The Mantrailing App installed, as updates may improve file compatibility and integration with Windows.

Please let me know the file type and how you are trying to open it, and we can adjust the steps accordingly. If these general steps don’t resolve it, we can explore more advanced options such as checking app permissions or verifying if the app integration with Windows file handling needs troubleshooting.

Are you okay trying these steps? Let me know how it goes!