PS5 FPKG Builder v1.0.3

What's new

• Added PKG extraction workflow in the Reader tab.
• Added extraction destination selection and source-folder extraction flow.
• Improved Build flow for imported image formats by preparing/extracting source content before package generation.
• Improved AMPR/LZ4 folder handling and preserved-tree build compatibility.
• Added better support for OSFMount-assisted mounting when available.

Improvements

• Reworked the main Build layout to give more space to the configuration and log panels.
• Improved long path display in configuration fields.
• Removed unwanted horizontal scrolling in configuration and log areas.
• Improved log readability with line wrapping.
• Improved global progress behavior so internal build-stage percentages no longer jump the main progress bar to 85% too early.
• Improved temporary file cleanup after canceling builds.
• Improved disk-space preflight checks before extraction/build operations.

Fixes

• Fixed untranslated extraction section text.
• Fixed progress bar jumping because of internal LibProsperoPkg log percentages.
• Fixed clipped information on the right-side layout.
• Fixed extraction UI labels not updating when changing language.

Fix OSFMount Not Detected by PS5 FPKG Builder

PS5 FPKG Builder can optionally use OSFMount to mount .exfat, .ffpfs, .ffpkg, and related image formats without extracting the full image first.

If you see one of these messages:

OSFMount: driver not installed
OSFMount: driver disabled
OSFMount: run as administrator

follow the steps below.

1. Install the official version

Download and install OSFMount from the official website:

https://www.osforensics.com/tools/mount-disk-images.html

During installation, allow the OSFMount driver to be installed.

2. Restart Windows

After installing OSFMount, restart your PC.

This is important because the OSFMount driver can remain loaded or blocked until Windows restarts.

3. Run PS5 FPKG Builder as administrator

Right-click:

PS5 FPKG Builder.exe

Then choose:

Run as administrator

OSFMount requires administrator permission to mount images.

If the app shows:

OSFMount: run as administrator

it means OSFMount was detected, but PS5 FPKG Builder was not started with administrator privileges.

4. Check if OSFMount exists

Open PowerShell as administrator and run:

Test-Path "C:\Program Files\OSFMount\OSFMount.com"

If it returns:

True

the OSFMount executable was found.

If it returns:

False

reinstall OSFMount using the official installer.

5. Check if the driver exists

Still in PowerShell as administrator, run:

Get-ChildItem "C:\Program Files\OSFMount" -Filter osfdisk.inf -Recurse

If you see a path similar to:

C:\Program Files\OSFMount\win10\osfdisk.inf

the driver package is present.

6. Reinstall the driver manually

In PowerShell as administrator, run:

pnputil /add-driver "C:\Program Files\OSFMount\win10\osfdisk.inf" /install

Then restart Windows again.

7. If it still says the driver is not installed

Open Device Manager:

devmgmt.msc

Then go to:

Action > Add legacy hardware

Choose:

Install the hardware that I manually select from a list

Then:

Show All Devices > Have Disk

Point it to:

C:\Program Files\OSFMount\win10\osfdisk.inf

Finish the installation and restart Windows.

8. Test again

Open PS5 FPKG Builder as administrator.

The expected status is:

OSFMount: ready

Quick diagnostics

Use these commands in PowerShell as administrator:

Test-Path "C:\Program Files\OSFMount\OSFMount.com"
Get-ChildItem "C:\Program Files\OSFMount" -Filter osfdisk.inf -Recurse
pnputil /enum-drivers | Select-String -Pattern "osfdisk","OSFMount"

If osfdisk.inf exists but the app still reports the driver as missing, the legacy adapter ROOT\osfdisk was probably not created. In that case, use step 7.

Notes

• OSFMount is optional. If it is not working, PS5 FPKG Builder uses the internal method.
• For large files, OSFMount can be faster because it avoids extracting the entire image before the build.
• If you see a driver disabled error, reinstall OSFMount, restart Windows, and run PS5 FPKG Builder as administrator.
• The official OSFMount page recommends restarting and reinstalling if there is an osfmount.sys error or disabled driver error.

Sources

• Official OSFMount website: https://www.osforensics.com/tools/mount-disk-images.html
• PassMark forum about administrator permission: https://forums.passmark.com/osforensics-osfmount-osfclone/42651-osfmount-and-admin-rights