Каждый исполняемый файл osFree сщдержит строку с информацией о номере сборки (buildlevel). Обычно эта информация размещается в ресурсах, но также может быть в секциях кода или данных.

Обычное место для информации о build level это строка DESCRIPTION в DEF-файле:

Description '@#osFree:9.23#@Control utility for ANSI'   

Часто используется следующий синтаксис информации о build level:

@#<Vendor>:<Revision>#@<Description>

где <Vendor>, <Revision> и <Description> – ASCII строки с соответствующей информацией. В EDM/2 http://www.edm2.com/index.php/Adding_BLDLEVEL_information_to_executables упомянуты некоторые ограничения для полей <Vendor>, <Revision> и <Description>, но в реальности, длина может быть любой и формат версии тоже может быть любым. Например, такое бывает во многиз ревизиях OS2KRNL.

Пример:

Description '@#osFree:9.23#@Control utility for ANSI'

MPTN and TCP/IP services of osFree uses extended build level information. In most cases such information not stored as Description, but as asciiz constant string in code. This is why standard OS/2 bldlevel tool does not work for such files. Syntax is following:

@#<Vendor>:<Revision>#@##built <BuildDate> – on 
<BuildHost>;0.1@@<Description>[:<SubDescription>[:<SubDescription>…]

where

• <BuildDate> is date and time of build
• <BuildHost> is machine on which build compiled
• <SubDescription> is closer desctiption of software pack

Example:

Description '@#osFree:9.23#@##build 5 Oct 2003  15:00:00 – on RACERPC;0.1@@Command line tools:Control utility for ANSI'

Another most known, and most complex, type of build level information is following:

@#<Vendor>:<Revision>#@1## DD.MM.YY hh:mm:ss      <BuildHost>:<ASDFeatureID>:<LanguageCode>:<CountryCode>:<Build>:<Unknown>:<FixPackVer>@@<Description>

where

• DD.MM.YY is the build date in day/month/year, preceded by 1 space
• hh:mm:ss is the build time in hour/minute/second, preceded by 1 space
• <BuildHost> is machine on which build compiled, preceded by 8 spaces
• <ASDFeatureID> is identifier of ASD feature
• <LanguageCode> is code of language of component
• <CountryCode> is country code of component
• <Build> is build number
• <Unknown> is not known information (must be empty)
• <FixPackVer> is FixPack version (if distibuted as part of).

Note: If you leave build date and/or build time empty you still have to provide the same amount of spaces to replace build date/build time.

Example:

Description '@#osFree:9.23#@##1##RACERPC:0:866:7:436::WRR8706@@Control utility for ANSI'

Nowdays many projects use this BLDLEVEL format string.

• Adding BLDLEVEL information to executables