I also encountered this problem. I came across it in GroupDocs.Viewer version 24.6.0 for .NET Framework 4.6.2. I upgraded to the latest version 24.9.0 and the problem still occurs. On some environments the folder grows here: c:\Windows\Temp\CustomTempFonts, on others here: c:\Users\[user]\AppData\Local\Temp\CustomTempFonts. Do you want code to reproduce this on, or is the problem reproducible enough from earlier posts? Is there any workaround? When will this issue be fixed in the product?
Sorry for the inconvenience. We’ve logged this issue under “VIEWERNET-5060” moniker in our internal tracking system and started to investigate it.
We can see the same issue on our side, but you will be very helpful if you tell us files of which format(s) are causing this issue on your side? Source code will also be helpful, as it can narrow down the area our research.
Also, which size has the “CustomTempFonts” folder in your case?
With best regards,
Denis