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Unable to start SlipstreamViewer.exe - Entry Point Not Found #644

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opened 2026-10-10 13:32:51 +00:00 by Hemiva · 5 comments

Hemiva commented

2026-10-10 13:32:51 +00:00

Environment

Slipstream Beta 1.3.0.1
Microsoft Windows 11 64-bit (Build 22621.4317)

Description

Whenever I try to start the SlipstreamViewer.exe of the Beta 1.3.0.1 on my Windows 11 PC, I get the error message in the image attached. It reads:

The procedure entry point opj_decoder_set_strict_mode could not be located in the dynamic link library
[path to the Slipstream folder]\SlipstreamViewer.exe

If it helps to narrow down the issue: in my PC, the D: drive is a hard drive, while the C: drive is the SSD where the operating system is installed.

Reproduction steps

It just happens when I try to open the SlipstreamViewer.exe from the Beta 1.3.0.1 version.

### Environment Slipstream Beta 1.3.0.1 Microsoft Windows 11 64-bit (Build 22621.4317) ### Description Whenever I try to start the _SlipstreamViewer.exe_ of the **Beta 1.3.0.1** on my Windows 11 PC, I get the error message in the image attached. It reads: > The procedure entry point opj_decoder_set_strict_mode could not be located in the dynamic link library [path to the Slipstream folder]\SlipstreamViewer.exe If it helps to narrow down the issue: in my PC, the D: drive is a hard drive, while the C: drive is the SSD where the operating system is installed. ### Reproduction steps It just happens when I try to open the SlipstreamViewer.exe from the **Beta 1.3.0.1** version.

Screenshot 2026-10-10 __2217.png

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Hemiva added the

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2026-10-10 13:32:51 +00:00

Hemiva added this to the Slipstream project

2026-10-10 13:32:51 +00:00

Hemiva commented

2026-10-10 14:05:01 +00:00

Author

Adding to this, it might be of note that I used the .zip installation, rather than the .exe setup installer.

sky_line commented

2026-10-10 21:15:46 +00:00

Owner

Thanks for the report. We've found the cause: the 1.3.0 Beta 1 Windows build shipped an old openjp2.dll (OpenJPEG 2.4.0) next to an exe that needs 2.5.x. Your drives aren't the problem. The fix is tracked in #647, and a fixed Windows build will follow.

Thanks for the report. We've found the cause: the 1.3.0 Beta 1 Windows build shipped an old `openjp2.dll` (OpenJPEG 2.4.0) next to an exe that needs 2.5.x. Your drives aren't the problem. The fix is tracked in #647, and a fixed Windows build will follow.

sky_line referenced this issue

2026-10-10 21:15:46 +00:00

Windows 1.3.0 Beta 1: stale openjp2.dll (2.4.0) - 'opj_decoder_set_strict_mode' entry point not found at launch #647

sky_line commented

2026-10-10 22:41:35 +00:00

Owner

Fixed in 1.3.0 Beta 2, now available from the downloads page and the update feed. The Windows zip and installer ship OpenJPEG 2.5.4, so the viewer starts again. If you unpacked the zip over an older install, use a fresh folder or let the installer replace it. Please let us know if it still fails.

Fixed in **1.3.0 Beta 2**, now available from the downloads page and the update feed. The Windows zip and installer ship OpenJPEG 2.5.4, so the viewer starts again. If you unpacked the zip over an older install, use a fresh folder or let the installer replace it. Please let us know if it still fails.

Hemiva commented

2026-10-10 23:03:19 +00:00

Author

Testing on Beta 1.3.0.2, the .exe initiates properly on Windows. Closing the issue.

Testing on **Beta 1.3.0.2**, the .exe initiates properly on Windows. Closing the issue.

Hemiva closed this issue

2026-10-10 23:03:19 +00:00

sky_line commented

2026-10-11 02:27:11 +00:00

Owner

Fixed in 1.3.0 Beta 2, and confirmed working by users who had the error. Thanks for reporting!

Fixed in **1.3.0 Beta 2**, and confirmed working by users who had the error. Thanks for reporting!

sky_line removed the

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2026-10-11 02:27:12 +00:00

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sky_line/Slipstream#644

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