Right-click on the Moldflow shortcut (both Launcher and Solver) → Properties → Compatibility → Check "Run this program as an administrator." Do this for:
This bypasses UAC-related lock file creation issues.
Ensure real-time scanning excludes Moldflow directories. Schedule full scans only during idle periods (midnight to 5 AM). autodesk moldflow error 99998 exclusive
In Moldflow > Tools > Options > File Locations, set automatic backup interval to 5–10 minutes and specify a local backup path. If a crash corrupts the lock, you lose fewer changes.
Error 99998 exclusive often hides a permissions problem. Use this PowerShell script (run as Administrator): Right-click on the Moldflow shortcut (both Launcher and
$projectPath = "D:\Moldflow_Projects\YourProject"
takeown /F $projectPath /R /D Y
icacls $projectPath /grant "$env:USERNAME:(OI)(CI)F" /T
icacls $projectPath /reset /T
This forces full ownership and resets ACLs. After running, retry the study.
If the project is on a network drive, copy the entire project folder (e.g., C:\Temp\MyProject) to your local SSD. Open it locally. If the error disappears, the problem is network-related (latency, SMB, or NAS locking). If it persists locally, proceed to advanced fixes. This bypasses UAC-related lock file creation issues
If you are not the file owner or lack "Full Control" over the project folder, Moldflow cannot request exclusive write access. This is common after IT migrations, where old user SIDs linger.
You might see this error in several forms:
Regardless of the phrasing, the core issue is contention—something is fighting Moldflow for resources it needs exclusively.