as shown in the screenshot  you cannot see the extention of the file so same named files with long name and different extention cannot be distinguished
well it has a workaround, you can hover the file and see the bubble but I have a suggestion:
in many apps and programms when a filename is displayed at least the extention is visible in the end like so: google-docs-sear...6_x64.odt
also in the same example you can add the last few chars, so, if two files are named almost the same but some chars in the end are different, you can see the difference!
proposed changes mockup
all images together
Steps to Reproduce:
1. open libreoffice (you see the recent files) see 
2. no extention visible if the file name is big
pic [1.1] no way to see last chars or at least extention so same named files with different extention or almost same named files look the same (if they have the same thumbnail then they are indistinguishable)
show last few chars and extention as shown in a quick mockup [3.1]
User Profile Reset: No
Version: 184.108.40.206 (x64)
Build ID: 2412653d852ce75f65fbfa83fb7e7b669a126d64
CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win;
Locale: en-US (en_US); UI-Language: en-US
Created attachment 151994 [details]
 screenshot the same as image  in bug
its the same image as the screenshot  in the bug
Created attachment 151995 [details]
 the suggested changes - mockup, same as the mockup  in the bug report
its the same image as the mockup 
+1 from me
UX-team, what do you think?
Not a fan. We already provide the full path with extension (if any) as a Tool-tip on mouse over of the thumbnail. Labeling with the file name--suplemented with the full path name & extension was the design decision when we laid out the StartCenter.
See no reason to change that now.
IMHO => WF
I also think extension should be visible. I had never noticed it was visible with the tooltip.
IMHO, we should even see the extension as a very visible tag upon the preview icon.
What you likely want to know is the module in which the file would be loaded. Meaning odt = Writer, ods = Calc etc. That applies also to docx and xlsx but how about hdg or nyz? (fictional file extension you never heard about). So wouldn't the best solution be a small overlay MIME type icon indicating the LibreOffice module?
Most of the time, yes.
But sometimes I need to make a distinction between an odt file, a doc file, a text file that have the same name.
(In reply to Olivier R. from comment #7)
> Most of the time, yes.
So let's have an overlay with the MIME type icon for the relevant cases and stick to the tooltip if in doubt according comment 4.