FileCheck is the best filechecker for AMMS, i think. There are many options
and features:

 - checking files for errors
 - checking for duplicates / optionally a fast dupe-checker
 - get file_ids from files
 - add files
 - strip files
 - convert file_ids
 - remove chars in file_ids
 - add a line to file_ids
 - remove lines in file_ids
 - operations can be disabled
 - only needed dirs will be checked
 - many supported filetypes
 - many options
 - nice interface
 - setreturn is directly supported
 - own outputs can be configured
 - ...

This is a small update. You have to install version 2.50 before use this.

============================= Archive contents =============================

Original  Packed Ratio    Date     Time    Name
-------- ------- ----- --------- --------  -------------
    9112    8948  1.7% 17-Apr-97 20:57:46 +FileCheck
     630     400 36.5% 20-Apr-97 11:39:30  readme.txt
     655     254 61.2% 20-Apr-97 11:41:12  file_id.diz
-------- ------- ----- --------- --------
   10397    9602  7.6% 20-Apr-97 11:41:20   3 files

 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 8948    9112  98.2% -lh5- b14c Apr 17  1997 FileChecker/mbeigene/Cannon/FileChecker/FileCheck
[generic]                  400     630  63.5% -lh5- af6f Apr 20  1997 readme.txt
[generic]                  254     655  38.8% -lh5- ee74 Apr 20  1997 file_id.diz
[generic]                  614    1239  49.6% -lh5- 4308 Apr 20  1997 FCheck251.readme
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         4 files   10216   11636  87.8%            Apr 20  1997