All I changed was the file and the format. This happens for a specified folder or the folder returned by getTempDirectory(). I’ve tried setting adding “Everyone” will full access, to no avail. But, considering zip files work fine, while gzip files do not, this doesn’t seem like a user access issue. The gzip file opens fine with 7-Zip.
Windows 11
Lucee 5.3.9.133
Compress Tags 1.0.0.12 (also tried 1.0.0.14-SNAPSHOT)