Office Powerpoint Macro files list dialog is empty when the page have colon (:) in the name

Summary

The list with files names available for Office Powerpoint Macro is empty when the page name have colons.

Steps to Reproduce

1. Create a page with a colon in the name
2. Attach pptx file to the page
3. Save the page
4. "Insert more content" -> Other Macros -> Search for Office Powerpoint Macro
5. In the dialog window try to choose the file

Expected Results

The list is empty

Actual Results

The list should contain powerpoint files attached to the page

Workaround

Avoid using the colon in the page name.