If you decide to keep the file and use it with the risk of possible payload it may carry, you can restore it from the AVG Virus Vault, and manually exclude it from the AVG detection:
If the file is detected as a Potentially Unwanted Program
Please open AVG - menu "Tools" - "Advanced settings" - "Potentially Unwanted Programs". Click "Add exception" and browse to the file.
If the file is detected as a virus
Please open AVG - menu "Tools" - "Advanced settings" - "Anti-Virus" - "Resident Shield" - "Exceptions". "Add Path" to the folder which contains the file or use "Add File" to exclude the file itself.
Please note that the file will be still detected by AVG test. However, you can disable automatic healing in AVG - menu "Tools" - "Advanced settings" - "Scans" - "Whole computer scan" - disable the option "Automatically heal/remove infections".
To disable automatic healing by scheduled scan open AVG- menu "Tools" - "Advanced settings" - "Schedules" - "Scheduled scan" - "How to scan" - disable the option "Automatically heal/remove infections".
http://www.avg.com/gb-en/detection-analysis-results