When installing the Access client solution, ACS 1.1.9.1 application, the application's default working directory is created in the C:\Users\username\IBM

directory. Is it possible to change it and specify another working directory by changing a configuration somewhere in a config file?

Dear Isabelle

What purpose do you want to achieve by wanting a change of this directory path?

When you look into ACS install script file  install_acs_xx.js, the path  C:\Users\<user name>  is obtained from Windows environment variables named  HOMEDRIVE and HOMEPATH.  So, you can change these 2 environment variable before the install and the path will change but you may need to always use this same variables' values and it may affect other Windows application as well when you use them.  This change can have a troubling consequence depending on how many other Windows applications you installed in the past that use these 2 environment variables while they run. 

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Education is not the learning of facts but the training of the mind to think. -- Albert Einstein.
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Satid S.
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Hi,

If your question is about configuration files only, not about binaries (JAR file, launchers), you may use the AcsBaseDirectory directive as explained here: https://www.ibm.com/support/pages/ibm-i-access-acs-getting-started#9.3 (for example C:/ACS_Conf/{USER}/ , note the forward slashes).

Of course, for a single-user installation {} variables are not mandatory.

If it is about the whole product including binaries, you may find some relevant information here: https://developer.ibm.com/articles/i-ibmi-access-client-solutions-2/ ("Custom location for product files").