Error importing backup. Attachment filename contains character not allowed in windows directory name.

Here is the exception generated:

java.io.FileNotFoundException: D:\data\confluence\conf-func\temp\import_05052005_150930\attachments\4146\Sp?cifications Rec Kondor FXO_cashflow_raid_v1.doc\1 (The system cannot find the path specified)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(FileOutputStream.java:179)
at java.io.FileOutputStream.<init>(FileOutputStream.java:131)
at com.atlassian.confluence.util.zip.AbstractUnzipper.saveEntry(AbstractUnzipper.java:27)
at com.atlassian.confluence.util.zip.FileUnzipper.unzip(FileUnzipper.java:47)
at com.atlassian.confluence.util.GeneralUtil.unzipFile(GeneralUtil.java:1278)