Modpacks with ":" in their name fail to export silently

[okunamayanad]

Please confirm the following.

• I checked the existing issues for duplicate problems
• I have tried resolving the issue using the support portal
• I have ensured my Modrinth App installation is up to date

What version of the Modrinth App are you using?

Modrinth App 0.9.2 windows 10.0.26100

What operating systems are you seeing the problem on?

No response

Describe the bug

If you try to export a modpack with ":" in its name, Modrinth app will export a file with the name before ":" with 0 bytes

For example: "AB:C" modpack will export as "AB" and won't work (as the file is literally 0 bytes)

Steps to reproduce

1. Create a modpack with ":" in the name
2. Export the modpack
3. Check the exported file
4. See the error

Expected behavior

It should warn users about unsupported characters in their pack name for their OS

Additional context

As context: You can't create ":" in name for a file on Windows

[EgorBron]

+1, just creates an empty file named with part preceding the colon.

Also, when the slash appears in the modpack name, it tries to open a file in a directory named as the anything before last slash!

The question and exclamation mark, and, maybe other special characters, also throw the filename syntax error.

(error in Russian because my Windows is in Russian)