When clicking on a file icon in the extra column, the file should be opened.

[koppor]

1. Create a bib entry
2. Attach a Markdown (.md) file to it (via drag and drop)
3. Configure an extra entry table column to show Markdown files as described at Added documentation for extra file columns user-documentation#526
4. The entry table now has a Markdown column
   
5. Click on the icon
6. See that nothing happens

Expected behavior: Markdown editor opens.

Double check: If clicking on the file column, the editor opens

[gabenogu]

Hello, my name is Gabriel. I am working with a group of student developers from FIU and we would love to work on this issue. Thank you!

[koppor]

/assign @gabenogu

[github-actions]

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[gabenogu]

Good morning, so me and my group were looking at the issue and came up with some ideas but we were wondering where specifically to look in the IDE or repository in general to write the logic. Thank you for the help!

[Siedlerchr]

@gabenogu as a starting point I would look here in the MainTableColumnFactory

jabref/src/main/java/org/jabref/gui/maintable/MainTableColumnFactory.java

Lines 107 to 112 in 175acb3

	case EXTRAFILE:
	if (!column.getQualifier().isBlank()) {
	returnColumn = createExtraFileColumn(column);
	}
	break;
	case SPECIALFIELD: