Machine-Readable
Papa’s Best STL Thumbnails icon

Internal Error 2602 Autocad High Quality «ULTIMATE — BLUEPRINT»

A shell extension that adds preview thumbnails for STL files to Windows Explorer. Runs on Windows 7 or later.

Can also be used with Total Commander and FreeCommander.

Papa’s Best STL Thumbnails displaying a folder with random STLs from thingiverse

Download

Updated (changes, license).

Feel free to donate if you like my program!

64-bit Setup

recommended

32-bit Setup

for old systems

Video Guide

Michael from Teaching Tech made a video guide about the installation. He was so kind to allow me to embed it here! Thumbnail installation starts at 1:49.

Fast

Thumbnail generation is based on the fastest STL viewer available. Folders full of STL files are no problem, and most STL thumbnails are generated as fast as those of JPG photos.

Free

Compatible

Papa’s Best STL thumbnail viewer displays countless STL variations, even where other programs fail:

Internal Error 2602 Autocad High Quality «ULTIMATE — BLUEPRINT»

Autodesk AutoCAD is the gold standard for CAD professionals, but even the most robust software is prone to cryptic errors. Among the most frustrating is the Internal Error 2602 . If you have seen a dialog box stating, "Internal Error 2602. \src\acdb\acbl3\acdbmpolygon.cpp," you know the panic that follows: your work stops rendering, layers disappear, or the software crashes entirely.

This article provides a high-quality, technical deep dive into why Error 2602 occurs and how to fix it permanently. Unlike generic Windows crashes, Internal Error 2602 is specific to AutoCAD’s database handler ( acdb ). The file path in the error ( acdbmpolygon.cpp ) points to a problem with MPolygon objects . internal error 2602 autocad high quality

Internal Error 2602 is almost never a bug in AutoCAD's installation. It is a data corruption issue inside the DWG file related to high-quality visual representation of polygons. By stripping out the "high quality" render data (via downgrading or DXF) and deleting the offending MPolygon, you can restore your file to full health in under 10 minutes. Need further help? Leave a comment below with the exact Visual Style you were using when the error occurred. Autodesk AutoCAD is the gold standard for CAD


Installation for all users

Papa’s Best STL Thumbnails installs for the current user by default. To install for all users on a system, open a command prompt or a PowerShell and run msiexec /i "Papas Best STL Thumbnails.msi" MSIINSTALLPERUSER="".

Repeat with every update!

Autodesk AutoCAD is the gold standard for CAD professionals, but even the most robust software is prone to cryptic errors. Among the most frustrating is the Internal Error 2602 . If you have seen a dialog box stating, "Internal Error 2602. \src\acdb\acbl3\acdbmpolygon.cpp," you know the panic that follows: your work stops rendering, layers disappear, or the software crashes entirely.

This article provides a high-quality, technical deep dive into why Error 2602 occurs and how to fix it permanently. Unlike generic Windows crashes, Internal Error 2602 is specific to AutoCAD’s database handler ( acdb ). The file path in the error ( acdbmpolygon.cpp ) points to a problem with MPolygon objects .

Internal Error 2602 is almost never a bug in AutoCAD's installation. It is a data corruption issue inside the DWG file related to high-quality visual representation of polygons. By stripping out the "high quality" render data (via downgrading or DXF) and deleting the offending MPolygon, you can restore your file to full health in under 10 minutes. Need further help? Leave a comment below with the exact Visual Style you were using when the error occurred.


Dark background on some thumbnails

a folder with two thumbnails whose background is entirely black

Clear your Explorer thumbnail cache (see above) or copy the file to a different location.

This is a bug in Windows 10 that also affects other thumbnails – for example transparent PNG images here and here.

I can’t do anything in my program to work around it, I’m afraid. Please use the Windows 10 feedback function to report this to Microsoft. If enough users do it, they may eventually fix it. Windows 7 does not have this bug.


Something Missing?

Encountered a problem? Have a suggestion? Let me know: